It was clearly not a catch according to the rule:
"If a player goes to the ground in the act of catching a pass (with or without contact by an opponent), he must maintain control of the ball throughout the process of contacting the ground, whether in the field of play or the end zone. If he loses control of the ball, and the ball touches the ground before he regains control, the pass is incomplete. If he regains control prior to the ball touching the ground, the pass is complete."
Did Dez go to the ground in the act of making the catch? Absolutely, without a doubt.
Did he maintain control of the ball throughout the process of contacting the ground? No, without a doubt.
There is no bias here, it wasn't a catch and to argue otherwise indicates lack of understanding of the rules as they are written. A football move doesn't factor into this rule, so stretching the ball is meaningless. Well, except for the fact that if he tucked it on the way to the ground instead of stretching it, it's likely first and goal from the two yard line.