Google replaced pushing Git tags for certain source code with obtaining source code via Google Drive after making a request through Google Forms. It's completely ridiculous and they've gradually become very slow at handling requests. They're in clear violation of the GPLv2 now.
I found the wording to be confusing, but if it helps anyone else, I think the situation is
Git tags are just markers. If tags are the only thing that moved you can still access the repo, right? Just no version tags.