Dont think so Ray....
His form looks great and "leaning in" is an ASSET for barebow shooting without sights...
Actually, he is "Leaning" down which can reduce the "sight picture" between the arrow and the target by 50% making aiming much more accurate.
However,if one subscribes to a "Instinctive" school rather than one of "Split-Vision" then this will make no sense whatsoever.