Quoting the OP, "Regardless of whether you agree or disagree with Damore, he was engaged in free speech." This sounds like it refutes your statement, no?
Having worked there when this happened, the discourse definitely felt like, "Google is stifling the free speech of one of their employees" vs "Google has the right to fire employees for any reason."
> Open discourse can exist as a value too
It does (are we not engaging in it right now?).
There were (and I assume still are) plenty of random internal mailing lists where those types of discussions happened. I mostly stayed away from them because my goal at Google was to build cool products, not waste my day on internal mailing lists; I prefer to go to HN to do that.
> Just as LeBron James has the right to defend the genocidal regime of China.
I guess the NBA and China is the Godwin's law equivalent for free speech. He has the legal right to say what he wants, he doesn't have the right to have what he says have zero consequences (which is what the comic says).
You argue that he doesn't have a choice, but he does: he can speak his mind and potentially lose access to his largest market; he's just unwilling to do that because he deems the economic ramifications are too large. You always have a choice, most just choose to not make the hard one.