Remember, about a month ago Sam posted a comment along the lines of "AI will be capable of superhuman persuasion well before it is superhuman at general intelligence, which may lead to very strange outcomes". The board was likely spooked by the recent breakthroughs (which were most likely achieved by combining transformers with another approach), and hit the panic button. Anything capable of "superhuman persuasion",…
But they didn’t hit the panic button. They said Sam lied to them about something and fired him.
That's the claim at least.