Earlier quoted context omitted.
That makes no sense. He is the CEO and on the board, he _is_ the decision maker and could reverse any action he disagreed with. Any disagreement was purely theatre.
A CEO isn't a dictator. They still need board support. If everyone on the board decided that Jack wasn't the guy anymore, Jack can't wave a magic wand and make them disappear. CEOs have been ousted many times.
Jack saying he didn't like decisions Twitter made is like if I started complaining that I didn't like the restaurant I chose for dinner.