I'm not sure how anyone can be so sure of this. Like someone has mentioned in this thread, worse managers have been appointed at different tiers in the PL. Regardless of the abject end to his tenure at United, he has some bright spots that may persuade a chairman or two to give him a chance. AIf you mean he punched above his weight (managerial expertise) because he is a shite manager - sure. He managed to fool a lot of people for a lot of time.
on the other hand if you are Watford or Leeds in their current position in the table and looking at Oles resume - I wouldn’t touch him with a Bluetooth.. and I’m pretty sure most owners will think the same way.