Hi @MrMeeseeks ,
I have tested this and it seems like gtag is removed when you delete the content snippet ( not deactivate)
Here are the steps for you
1. In Portal Management > Content Snippet > Believe you are having your "Tracking Code" Content snippet .
2. Add your gtag script under value
3. Go to your portal studio > refresh > and press "Sync configuration"
4. In a new tab > load the website and then hit "Ctrl+ F5"
If you look at the Chrome Dev tools > network tab > you can see "Analytics.js" is now loading (Screenshot for your kind reference)

Delete the Tracking Code snippet:
1. In portal management > content snippet > Select Tracking Code and delete it
2. In Portal studio > > refresh > and press "Sync configuration"
4. In a new tab > load the website and then hit "Ctrl+ F5"
In Chrome dev tools > network tab

Hope it helps.
------------
If you like this post, give a Thumbs up. Where it solved your request, Mark it as a Solution to enable other users find it.