When he wanted to remove a pebble from his shoe, he talked extensively of the company decisions, in the higher ups, which is more than fair given his role.
He never struck me as a "Steve Jobs of coding" (probably today Elon Musk?).
I also had several encounters with John Romero and talked a bit about the times at id Software and he never ever hinted that Carmack was problematic in any way.
He's also obviously not a very good politician/sellperson (he can't sell what he hasn't already produced or envisioned) and suffers bureaucracy, like every normal person here that is not a bureaucrat.
Anyway.
Regardless of the truthfulness of what you write, Carmack has always been able to deliver, both in time and as of code quality and maintainability, one way or another, Meta hasn't.
The evidence pile up more against FB/Meta management than against Carmack, moreover I think it's easy to attack the person taking responsibility in person than those hiding in the shadows, Linus suffered the same destiny, but he created Linux and brought it where it is now, the attackers didn't, so maybe Linus was simply right.