Did you copy and paste in the code to make the flow?
I think the guide is intended to be used after using the copy and paste and the flow is made. Then follow the guide to adjust any settings within the flow.
If you go to the link, scroll down to the reply from @takolota that is made on 06-06-2022 4:14PM and copy all of that code in the reply. Then in your flow go to "My clipboard" and press Ctrl+V to paste the code into your flow which will create all of the actions.
Then follow the video steps.
https://powerusers.microsoft.com/t5/Power-Automate-Cookbook/Batch-Update-SharePoint-List/td-p/1365410

Here is the code from the linked page to copy and paste:
{"id":"e92739c5-307f-46dc-aad9-a7bc687fa96f","brandColor":"#8C3900","connectionReferences":{"shared_excelonlinebusiness_1":{"connection":{"id":"/providers/Microsoft.PowerApps/apis/shared_excelonlinebusiness/connections/512f9c45ec1947d386e56055c70ac7e2"}},"shared_sharepointonline_2":{"connection":{"id":"/providers/Microsoft.PowerApps/apis/shared_sharepointonline/connections/f2c62e9ce2fc415c8103a6205da5f9d3"}}},"connectorDisplayName":"Control","icon":"data:image/svg+xml;base64,PHN2ZyB3aWR0aD0iMzIiIGhlaWdodD0iMzIiIHZlcnNpb249IjEuMSIgdmlld0JveD0iMCAwIDMyIDMyIiB4bWxucz0iaHR0cDovL3d3dy53My5vcmcvMjAwMC9zdmciPg0KIDxwYXRoIGQ9Im0wIDBoMzJ2MzJoLTMyeiIgZmlsbD0iIzhDMzkwMCIvPg0KIDxwYXRoIGQ9Im04IDEwaDE2djEyaC0xNnptMTUgMTF2LTEwaC0xNHYxMHptLTItOHY2aC0xMHYtNnptLTEgNXYtNGgtOHY0eiIgZmlsbD0iI2ZmZiIvPg0KPC9zdmc+DQo=","isTrigger":false,"operationName":"Batch_update_from_external_data","operationDefinition":{"type":"Scope","actions":{"Do_until_Update":{"type":"Until","expression":"@less(length(body('List_rows_present_in_a_table')?['value']), 99990)","limit":{"count":150,"timeout":"PT8H"},"actions":{"Scope_Batch_update_items_in_1st_100k_SP_records":{"type":"Scope","actions":{"Do_until":{"type":"Until","expression":"@less(length(body('Select')), sub(outputs('settings')['batchSize'], 5))","limit":{"count":150,"timeout":"PT7H"},"actions":{"Select":{"type":"Select","inputs":{"from":"@take(skip(body('Filter_array_Remove_items_without_a_key_to_ID_match_in_SharePoint'), mul(outputs('settings')['batchSize'], iterationIndexes('Do_until'))), outputs('settings')['batchSize'])","select":"@replace(replace(outputs('batchTemplate'),'|ID|', string(item()?['ID'])), '|RowData|', string(item()))"},"runAfter":{},"metadata":{"operationMetadataId":"d90bce05-ae93-482c-a536-bd36310988b6"}},"batchData":{"type":"Compose","inputs":"@join(body('Select'), decodeUriComponent('%0A'))","runAfter":{"Select":["Succeeded"]},"metadata":{"operationMetadataId":"37cd3c50-9877-4ec3-a32f-33290e7cf6cb"}},"SendBatch":{"type":"ApiConnection","inputs":{"host":{"connection":{"name":"@json(decodeBase64(triggerOutputs().headers['X-MS-APIM-Tokens']))['$connections']['shared_sharepointonline_2']['connectionId']"}},"method":"post","body":{"method":"POST","uri":"/_api/$batch","headers":{"X-RequestDigest":"digest","Content-Type":"multipart/mixed;boundary=batch_@{actions('settings')?['trackedProperties']['batchGUID']}"},"body":"--batch_@{actions('settings')?['trackedProperties']['batchGUID']}\nContent-Type: multipart/mixed; boundary=\"changeset_@{actions('settings')?['trackedProperties']['changeSetGUID']}\"\nContent-Length: @{length(outputs('batchData'))}\nContent-Transfer-Encoding: binary\n\n@{outputs('batchData')}\n--changeset_@{actions('settings')?['trackedProperties']['changeSetGUID']}--\n\n--batch_@{actions('settings')?['trackedProperties']['batchGUID']}--"},"path":"/datasets/@{encodeURIComponent(encodeURIComponent(outputs('settings')['siteAddress']))}/httprequest","authentication":{"type":"Raw","value":"@json(decodeBase64(triggerOutputs().headers['X-MS-APIM-Tokens']))['$ConnectionKey']"}},"runAfter":{"batchData":["Succeeded"]},"limit":{"timeout":"P1D"},"metadata":{"flowSystemMetadata":{"swaggerOperationId":"HttpRequest"},"operationMetadataId":"16e4dda3-3bad-46d0-a0ce-a919bada5f25"}},"Results":{"type":"Compose","inputs":"@base64ToString(body('sendBatch')['$content'])","runAfter":{"SendBatch":["Succeeded"]},"metadata":{"operationMetadataId":"fa9b68d1-10d2-4ca3-8a3a-05c3c14c2f54"}}},"runAfter":{"Filter_array_Remove_items_without_a_key_to_ID_match_in_SharePoint":["Succeeded"]},"metadata":{"operationMetadataId":"c2b0cb55-964e-4bd4-8484-fcf245bd3932"}},"Filter_array_Remove_items_without_a_key_to_ID_match_in_SharePoint":{"type":"Query","inputs":{"from":"@body('GenerateSPData')","where":"@not(equals(item()?['ID'], null))"},"runAfter":{"GenerateSPData":["Succeeded"]},"metadata":{"operationMetadataId":"1c5c3129-35c5-444d-9a4f-aad8f88a4446"}},"GenerateSPData":{"type":"Select","inputs":{"from":"@body('List_rows_present_in_a_table')?['value']","select":{"__metadata":"@json(concat('{\"type\":\"SP.Data.', if(empty(outputs('settings')['ListWebAddressName']), replace(replace(outputs('settings')['listName'], '_', '_x005f_'), ' ', '_x0020_'), replace(replace(outputs('settings')['ListWebAddressName'], '_', '_x005f_'), ' ', '_x0020_')), 'ListItem\"}'))","ID":"@outputs('Compose_Reformat_keys_to_single_JSON_object')?[concat(item()[outputs('settings')['NewDatasourceKeyColumnName']], if(empty(outputs('settings')['NewDatasourceKeyColumnName2']), '', item()[outputs('settings')['NewDatasourceKeyColumnName2']]))]?['ID']","Date":"@addDays('1899-12-30', int(item()['Date']), 'u')","Title":"@item()?['Name']","Email":"@item()?['Email']","Status":"@item()?['Status']"}},"runAfter":{"Compose_Reformat_keys_to_single_JSON_object":["Succeeded"]},"description":"In the ID row expression, replace item()?['Email'] with the column(s) in the updated data that make up the keys. Ex: replace it with concat(item()?['ExcelColumnName1'], item()?['ExcelColumnName2']) for a multi-column key.","metadata":{"operationMetadataId":"ce0487d5-63c8-40b4-9b4c-5229c0439c94"}},"Compose_Reformat_keys_to_single_JSON_object":{"type":"Compose","inputs":"@json(replace(replace(replace(string(body('Select_Keys_from_Get_items_1')), '[{', '{'), '}]', '}'), '},{', ','))","runAfter":{"Select_Keys_from_Get_items_1":["Succeeded"]},"metadata":{"operationMetadataId":"69b1d189-d56f-45fc-8dbb-a49740832a64"}},"Select_Keys_from_Get_items_1":{"type":"Select","inputs":{"from":"@outputs('Get_items_1st_100000')?['body/value']","select":{"@{concat(item()[outputs('settings')['SharePointKeyColumnName']], if(empty(outputs('settings')['SharePointKeyColumnName2']), '', item()[outputs('settings')['SharePointKeyColumnName2']]))}":"@item()"}},"runAfter":{},"description":"Action limit is 100k Get items records. Decide on 1+ columns to use on the left side as a unique key that is different for every record in the list. For a multiple column key list each, eg: item()?['Column1'], item()?['Column2'], item()?['Column3']).","metadata":{"operationMetadataId":"dac3de39-a3e5-422a-be37-81089ee64a51"}}},"runAfter":{"batchTemplate":["Succeeded"]},"metadata":{"operationMetadataId":"a32ffaf9-e457-4b81-92cf-531cf58ce133"}},"Scope_Batch_update_items_in_2nd_100k_SP_records":{"type":"Scope","actions":{"Do_until_2":{"type":"Until","expression":"@less(length(body('Select_2')), sub(outputs('settings')['batchSize'], 5))","limit":{"count":150,"timeout":"PT7H"},"actions":{"Select_2":{"type":"Select","inputs":{"from":"@take(skip(body('Filter_array_Remove_items_without_a_key_to_ID_match_in_SharePoint_2'), mul(outputs('settings')['batchSize'], iterationIndexes('Do_until_2'))), outputs('settings')['batchSize'])","select":"@replace(replace(outputs('batchTemplate'), '|ID|', string(item()?['ID'])), '|RowData|', string(item()))"},"runAfter":{},"metadata":{"operationMetadataId":"d90bce05-ae93-482c-a536-bd36310988b6"}},"batchData_2":{"type":"Compose","inputs":"@join(body('Select_2'), decodeUriComponent('%0A'))","runAfter":{"Select_2":["Succeeded"]},"metadata":{"operationMetadataId":"37cd3c50-9877-4ec3-a32f-33290e7cf6cb"}},"SendBatch_2":{"type":"ApiConnection","inputs":{"host":{"connection":{"name":"@json(decodeBase64(triggerOutputs().headers['X-MS-APIM-Tokens']))['$connections']['shared_sharepointonline_2']['connectionId']"}},"method":"post","body":{"method":"POST","uri":"/_api/$batch","headers":{"X-RequestDigest":"digest","Content-Type":"multipart/mixed;boundary=batch_@{actions('settings')?['trackedProperties']['batchGUID']}"},"body":"--batch_@{actions('settings')?['trackedProperties']['batchGUID']}\nContent-Type: multipart/mixed; boundary=\"changeset_@{actions('settings')?['trackedProperties']['changeSetGUID']}\"\nContent-Length: @{length(outputs('batchData_2'))}\nContent-Transfer-Encoding: binary\n\n@{outputs('batchData_2')}\n--changeset_@{actions('settings')?['trackedProperties']['changeSetGUID']}--\n\n--batch_@{actions('settings')?['trackedProperties']['batchGUID']}--"},"path":"/datasets/@{encodeURIComponent(encodeURIComponent(outputs('settings')['siteAddress']))}/httprequest","authentication":{"type":"Raw","value":"@json(decodeBase64(triggerOutputs().headers['X-MS-APIM-Tokens']))['$ConnectionKey']"}},"runAfter":{"batchData_2":["Succeeded"]},"limit":{"timeout":"P1D"},"metadata":{"flowSystemMetadata":{"swaggerOperationId":"HttpRequest"},"operationMetadataId":"16e4dda3-3bad-46d0-a0ce-a919bada5f25"}},"Results_2":{"type":"Compose","inputs":"@base64ToString(body('sendBatch_2')['$content'])","runAfter":{"SendBatch_2":["Succeeded"]},"description":"When copying a branch, change the 'sendBatch_#' part of the expression below to match the new SendBatch action above. Often it doesn't change the new copy's # in 'SendBatch_#'.","metadata":{"operationMetadataId":"fa9b68d1-10d2-4ca3-8a3a-05c3c14c2f54"}}},"runAfter":{"Filter_array_Remove_items_without_a_key_to_ID_match_in_SharePoint_2":["Succeeded"]},"metadata":{"operationMetadataId":"c2b0cb55-964e-4bd4-8484-fcf245bd3932"}},"Filter_array_Remove_items_without_a_key_to_ID_match_in_SharePoint_2":{"type":"Query","inputs":{"from":"@body('GenerateSPData_2')","where":"@not(equals(item()?['ID'], null))"},"runAfter":{"GenerateSPData_2":["Succeeded"]},"metadata":{"operationMetadataId":"1c5c3129-35c5-444d-9a4f-aad8f88a4446"}},"GenerateSPData_2":{"type":"Select","inputs":{"from":"@body('List_rows_present_in_a_table')?['value']","select":{"__metadata":"@json(concat('{\"type\":\"SP.Data.', if(empty(outputs('settings')['ListWebAddressName']), replace(replace(outputs('settings')['listName'], '_', '_x005f_'), ' ', '_x0020_'), replace(replace(outputs('settings')['ListWebAddressName'], '_', '_x005f_'), ' ', '_x0020_')), 'ListItem\"}'))","ID":"@outputs('Compose_Reformat_keys_to_single_JSON_object_2')?[concat(item()[outputs('settings')['NewDatasourceKeyColumnName']], if(empty(outputs('settings')['NewDatasourceKeyColumnName2']), '', item()[outputs('settings')['NewDatasourceKeyColumnName2']]))]?['ID']","Date":"@addDays('1899-12-30', int(item()['Date']), 'u')","Title":"@item()?['Name']","Email":"@item()?['Email']","Status":"@item()?['Status']"}},"runAfter":{"Compose_Reformat_keys_to_single_JSON_object_2":["Succeeded"]},"description":"In the ID row expression, replace item()?['Email'] with the column(s) in the updated data that make up the keys. Ex: replace it with concat(item()?['ExcelColumnName1'], item()?['ExcelColumnName2']) for a multi-column key.","metadata":{"operationMetadataId":"ce0487d5-63c8-40b4-9b4c-5229c0439c94"}},"Compose_Reformat_keys_to_single_JSON_object_2":{"type":"Compose","inputs":"@json(replace(replace(replace(string(body('Select_Keys_from_Get_items_2')), '[', ''), ']', ''), '},{', ','))","runAfter":{"Select_Keys_from_Get_items_2":["Succeeded"]},"metadata":{"operationMetadataId":"69b1d189-d56f-45fc-8dbb-a49740832a64"}},"Select_Keys_from_Get_items_2":{"type":"Select","inputs":{"from":"@outputs('Get_items_2nd_100000')?['body/value']","select":{"@{concat(item()[outputs('settings')['SharePointKeyColumnName']], if(empty(outputs('settings')['SharePointKeyColumnName2']), '', item()[outputs('settings')['SharePointKeyColumnName2']]))}":"@item()"}},"runAfter":{},"description":"When copying a branch, change the SharePoint value in the From field to the next Get items output that you added at the top of the flow.","metadata":{"operationMetadataId":"dac3de39-a3e5-422a-be37-81089ee64a51"}}},"runAfter":{"batchTemplate":["Succeeded"]},"metadata":{"operationMetadataId":"92a89bdf-e08b-4767-a93f-831f6b8eeb76"}},"batchTemplate":{"type":"Compose","inputs":"--changeset_@{actions('settings')?['trackedProperties']['changeSetGUID']}\nContent-Type: application/http\nContent-Transfer-Encoding: binary\n\nPATCH @{outputs('settings')['siteAddress']}_api/web/lists/getByTitle('@{outputs('settings')['listName']}')/items(|ID|) HTTP/1.1\nContent-Type: application/json;odata=verbose\nAccept: application/json;odata=verbose\nIf-Match: *\n\n|RowData|\n","runAfter":{"settings":["Succeeded"]},"metadata":{"operationMetadataId":"d0af0142-cd1d-437c-97a2-98210ea8dbde"}},"settings":{"type":"Compose","inputs":{"siteAddress":"https://OrgName.sharepoint.com/sites/SiteName/","listName":"ExampleListName","ListWebAddressName":"","batchSize":800,"SharePointKeyColumnName":"Email","SharePointKeyColumnName2":"","NewDatasourceKeyColumnName":"Email","NewDatasourceKeyColumnName2":""},"runAfter":{"List_rows_present_in_a_table":["Succeeded"]},"description":"List to batch update & the batch size (max 1000). Web address name if the list name changed. The column name(s) in SP & in the updated datasource to match in the lookup step (1st SP row /w matching key column value(s) is updated /w the new data).","trackedProperties":{"meta":{"type":"SP.Data.@{outputs('settings')?['listName']}ListItem"},"batchGUID":"@{guid()}","changeSetGUID":"@{guid()}"},"metadata":{"operationMetadataId":"459dc501-ad7e-4252-8540-df307a69607f"}},"List_rows_present_in_a_table":{"type":"ApiConnection","inputs":{"host":{"connection":{"name":"@json(decodeBase64(triggerOutputs().headers['X-MS-APIM-Tokens']))['$connections']['shared_excelonlinebusiness_1']['connectionId']"}},"method":"get","path":"/drives/@{encodeURIComponent('b!_EMfBFNtWEOa3ak75AQ0TW2Q1OX85QRDkj8zbxn7udyJYnSyNkLtSYhgHecJU74Y')}/files/@{encodeURIComponent(encodeURIComponent('01RD23GUU5UPXK7LQNWBCITP653FJPSCXW'))}/tables/@{encodeURIComponent('{ED2ABACC-AB30-4ACC-AC19-42CE68FEB007}')}/items","queries":{"source":"me","$top":100000,"$skip":"@add(mul(iterationIndexes('Do_until_Update'), 99998), iterationIndexes('Do_until_Update'))"},"authentication":{"type":"Raw","value":"@json(decodeBase64(triggerOutputs().headers['X-MS-APIM-Tokens']))['$ConnectionKey']"}},"runAfter":{},"description":"The expression in Skip Count will skip any 100k batches already loaded by previous loop runs. You may need to create something similar if you use any alternative get data action in this Do until loop.","runtimeConfiguration":{"paginationPolicy":{"minimumItemCount":100000}},"metadata":{"016B7R4Y7EON4XZ3K5URCJG7TCJZ2K7B6S":"/Power Automate Files/DateInfo.xlsx","flowSystemMetadata":{"swaggerOperationId":"GetItems"},"016B7R4YYVOTO4F52WHNAZ4NTGFWMYOH66":"/Power Automate Files/thanksgiving-metropolitan-ministries-holidays11-22.xlsx","operationMetadataId":"d3258554-7310-4453-9d1c-103d10112938","016B7R4Y3LVLCEITRXYVBIVHINFYOQURWY":"/Example_Folder/Example_File.xlsx","01RD23GUU5UPXK7LQNWBCITP653FJPSCXW":"/TestExcel.xlsx"}}},"runAfter":{},"description":"If you change the List rows present in a table to something else, change the length() expression below to the length of your new get data action & the 99990 to the new get data batch size. Then insert the action values in GenerateSPData From fields.","metadata":{"operationMetadataId":"f668d1f3-7245-4e88-9952-6b7e2bec05b9"}}},"runAfter":{"Get_items_2nd_100000":["Succeeded"]},"description":"Adjust the \"settings\" compose action to fit your data & datasources. Then adjust the GenerateSPData actions in each branch to include the right SharePoint column names & new updated data for your use-case.","metadata":{"operationMetadataId":"921a4fd4-4def-40df-a301-6402606fa56f"}}}