Yep, the arms seal the deal, he actually does a genuine chicken dance gesture with them. Couldn't have done it better if he tried.
It looked to me like two shots. Third punch in combo, i.e. left hook, was right on the button and big right hand to follow. What did you expect after that? Edit: I rewatched from the other angles. There were two left hooks.
Bull****. Of course a fast puncher/brawler is going have to alter his style against a granite chinned freak with his dome 7 ft in the air; Wlad is a pure boxer with a weak chin; Haye will bullrush him and fight in his usual style.