Sam Altman expelling Toner with the pretext of an inoffensive page (https://cset.georgetown.edu/wp-content/uploads/CSET-Decoding...) in a paper no one read* would have given him a temporary majority with which to appoint a replacement director, and then further replacement directors. These directors would, naturally, agree with Sam Altman, and he would have a full, perpetual board majority - the board, which is the only oversight on the OA CEO. Obviously, as an extremely experienced VC and CEO, he knew all this and how many votes he (thought he) had on the board, and the board members knew this as well - which is why they had been unable to agree on replacement board members all this time.
So when he 'reprimanded' her for her 'dangerous' misconduct and started talking seriously about how 'inappropriate' it was for a 'board member' to write anything which was not cheerleading, and started leading discussions about "whether Ms Toner should be removed"...
* I actually read CSET papers, and I still hadn't bothered to read this one, nor would I have found anything remarkable about that page, which Altman says was so bad that she needed to be expelled immediately from the board.