I think at this point it’s all part of his racket. He knows he’s a fraud but he’s on the gravy train and he’s damn well going to drink from it while he can.
Why bother to really try. Win or lose (and let’s face it, it’s lose) he still gets a huge pay out when he’s sacked. It’s almost like he’s asking for it at times.
Then on to the next mugs. Rinse and repeat.