It's not saying that it's not released by Google, but that it's not an officially supported Google product. I presume to make it clear that it's not covered by support agreements/bug bounties/etc. in the way products like Google Docs would be.
The reason you think he's "dodging" the questions is because you clearly don't know anything about the situation, like the fact that it was published under the github organization used by the workgroup he was in, same as a lot of other software the group authored.
Why does the repo say "This is not an officially supported Google product."?
Is it actually approved by Google or not?
You need to actually answer these questions instead of dodging them.