He's getting paid plenty by Sheffield United, and far too much to carry on the little old me managing little old Sheffield United, "just one of the lads, me." routine. He's also gotten far, far too much praise to little Englander, "no one cares about us English coaches, if I'd been called Wilderinho..." bullshit he comes out with as well.
The problem is that being an angry little man with a chip on your shoulder who thinks boasting about hating "do-gooders, leftists and psychologists" is something clever works when you're motivating a bunch of journeymen League 1 players, but when you get to the Premier League no one is impressed by it. Players who are technically good enough to play at this level don't need to put up with management ideas from the 1980's.
He couldn't get any of his expensive purchases to play well, his defence went to shit as soon as he lost one of the best young keepers in the country, and his one tactical innovation was worked out as soon as Premier League managers had seen it a couple of times.
What he was left with was a bunch of Championship and League 1 players wondering why they're getting blamed for not being Premier League quality every week while the manager absolves himself of all blame.