If you're like me and struggled to parse the title, my understanding is, "To obtain certain source code from Google, you could previously reference git tags, but now you have to fill out a form and wait for a human to give you a google drive link."

Let's just forget about the tags, the point is that they're not publishing what Graphene OS needs on any git repository that they can access.

Even before that it had been jokes of repositories, but at least you didn't have to ask for someone every time and wait for them to respond to the request.

(that's my understanding)