Below is the language about a "football move" in the rule book from 2014. Lot's of people infer diving or reaching with the ball but it's certainly not in any way clear that even those would qualify as a football move.
And I'll give you reaching, but as other have stated, Dez was falling more than diving.
c) maintains control of the ball long enough, after (a) and (b) have been fulfilled, to enable him to perform any act
common to the game (i.e., maintaining control long enough to pitch it, pass it, advance with it, or avoid or ward off an
opponent, etc.).