I'm starting to see where people can make an argument for it being a catch with the whole "making a football move" part. At first I didn't think you could clearly say he was making a football move, because the entire time he's falling and it's hard to determine intent, even though it looked like he was reaching forward with the ball. But now I'm seeing on the third foot down that he makes a hard push off that left leg. I'm starting to lean on the side that believes Dez made a football move with the third foot down, paying attention to the push of the leg and not the reaching forward with the ball.
However, I don't understand when people are saying he took three steps. If you jump up to make a catch, land on two feet, and take a step, nobody is going to say you took three steps. Those first two steps he took are the process of coming down to catch the ball. Still, up to about ten minutes ago I wasn't entertaining it being a catch based on the rules because I didn't think you could definitively state that Dez was making a football move, but now I'm starting to see why people feel so strongly otherwise.