Well, it’s not an ultimatum is it? Bill is the chairman but has zero say in who is appointed and fired. So bill making his feelings known to Farhad isn’t an ultimatum unless he said, sack him or I go…now that’s an ultimatum, which was never tweeted. So no, it’s not an ultimatum, it’s reads as a chairman making his feelings clear to the owner on what he would like to happen.
And it’s very plausible as Farhad chose him, not Bill or Brands. I wouldn’t put it past Bill to do that to get internal friends and maybe media friends on his side should the inevitable happen, and he can spin his story by saying ‘I told farhad’ etc etc.