Surprisingly many people in the linked Reddit thread seem to think that open source license means Google can re-license the code and strip the author info.
Which is the one thing you absolutely cannot do.
I took a look at the code, and it seems the author info was in pyproject.toml which is not license.
if there was a comment that said // TODO(username) and google removed all comments, is that violating any license?
They confuse it with public domain, which means exactly that.