Something in the explanation is missing here. It's still not clear to me from any of the provided context whether you got approval to release this. At least from my understanding of your role, if you had approval and used an official google repository, you would not get fired for merely publishing code that accesses a documented API through documented endpoints.

Hence many people are wondering if you released this without approval (that's my guess), if you used a Google repo to do it (from what I can tell you did use a google repo, but not an officially supported one, and other teams at google use this repo to publish code), and whether there were other extenuating circumstances, or if it was "the workspace SVP called my division's VP and told him to fire me" (just a guess for another firing mechanism).