Are you speaking about his ducking? You must be, because there is really nothing else to criticize. Apparently, since he could out equitate most people who are complaining about his position, he finds it helpful to ride the way he does.
Ducking certainly isn’t as attractive as the classic jumping equitation position, but I think it’s silly to nit pick a rider that can out ride most of the people who are complaining about his position.
His job is to train his horses to jump beautifully, and he is (and has been for decades) very good at it.