Of course they wouldn't, but if the conspiracies are correct, then United offered him the job, if the first thing he does is to slap them around the face by signing for Everton, they would probably look elsewhere.
To me its most likely that he didn't know United were about to offer him the job, I still believe he was applying pressure to the board, whilst also seeing what came up offers wise.. Turns out its the biggest job in English football and he took it.
Basically I believe its as the whole world is reporting it except on here, where without anything to back it up, he is being hung drawn and quartered for s**tting on a team he has put so much into, based on the conspiracy theories of a handful of anti moyes posters.