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.