I'm not 100% sure what your point is here, but the point I was making is that even in theory if you have a "firewall", your contract with Google (that you signed and agreed to) says that Google owns your code output even if it's done at home on your own time. It really comes down to (at least for Googlers in California) whether the work is related to Google's business (which often covers things like games, even if Google is not a game developer), and even then, you need to submit the work to the Googler lawyers and have them make the determination, before you get permission to publish the code on your own.

I saw this play out repeatedly with OSPO and saw many people who believed they had set up firewalls to allow this, and I understood Google's position and appreciated that they made it fairly easy for most people to open source their code.