The real story behind that is... complicated. First, Sam Altman allegedly does stuff that looks to be setting up a coup against the board, so the board fires Sam, but they don't provide proper context[0] and confuse everyone. So Sam gets Microsoft and a bunch of OpenAI employees to revolt and pressure the board to bring him back. He then fires the board and instates a new one, basically the original coup plan but now very much open and in the public eye.
[0] To be clear, most corporate communications try to say as little as possible about internal office politics. That can easily lead into defamation lawsuits.
No Musk required, the individuals at OpenAI did it to themselves.