By the rules, the hand is considered part of the ball. At best it's borderline.the defensive player did not cleanly block the ball, he got.mostly arm/wrist. This is a foul. Same goes for the Murray dunk, he was fouled as the LOUISVILLE player got all arm.
there were bad calls both ways. Murray got pushed in the back by Mahmoud (Mahmoud got all back and no ball) the caused a Murray turnover and a Louisville run out in the first half. It was a clear missed call. Also, Murray was fouled on his failed dunk attempt imo.