Yeah because once somebody gets to a certain level they should ignore their own flaws, and the rest of us should also just pretend those flaws don't exist when we see them. Both sound like what somebody who isn't very smart would do. Just saying.
The guy just won a World Championship, hardly the time for some couch potato to be pointing out his flaws and saying he is mentally weak. In my opinion, to win a World Championship, he could not possibly be mentally weak.
You can pretend whatever you want.
The guy got to be a World Champion by playing the way he plays. Can he get better - Probably. Can he mess himself up by changing his style = definitely.
Can he mess himself up by changing his mental approach = definitely.
At this point if he has a world class coach, the coach would probably tell him to not change anything, keep doing what got you to be a World Champion.
If his world class coach told him to slow down and change his mental approach it would be time for a new coach.