Mistimed maybe, but he was as p****d off as the rest of us and he is not good at hiding his emotions. Not the first time a manager has made odd comments in the heat of the moment in the aftermath of an important match.
I can't help thinking that whatever has happened actually occurred before...
Like others, can't possibly answer this until the facts are known. I would love Gus to stay if he has done nothing seriously out of order except shoot his mouth off a bit, but think it is highly improbable.