There's no doubt that the ball hits the ground. Can't argue that point.
The ruling on the field was of a completed pass by the official closest to the play. The ball hitting the ground and subsequent movement was of no consequence.
During the review they had to have decided to change their idea of whether he made a football move or not.
If he is judged to have made a "football move" then he becomes a runner and the ground cannot cause a fumble. That seemed to have been the initial ruling on the field. So was what was overturned was whether he made a "football move" or not?
If the question was whether Dez made a "football move" by switching the ball to his left hand, taking 3 steps, lunging toward the endzone, reaching the ball forward with his left hand, and having 2 knees and 2 elbows touch the ground BEFORE the ball hits the ground, is that good enough or did they decide that all of that was just part of the process of falling down? Is a "football move" part of the rule? I'm probably wrong anyway