He was going to the ground in the process of the catch. He never established possession (control) by 'completing the catch'. Stretching or lunging is not a 'football move'. How could you tell the difference between lunging with the football versus lunging after the football? Too often you would not be able to, so that is why they have specific rules about how you establish possession. Until you do so, it does not matter where you are on the field. Also, look at the replay again - the ball clearly touches the ground, after it comes loose when his left elbow hits the ground, before he has completed the catch. If he had managed to keep the ball off the ground it would have been a touchdown once he gained control, but he didn't and it did, so it wasn't.
If you look at the replay - it should be available in countless formats - and still don't see the ball move, I recommend you get your eyes checked.
Wrong again, the rule states that since the receiver initially made and secured the catch, even if the ball touches the ground “debatable” the ball can still move as long as the receiver doesn’t lose complete control “and he didn’t”, no evidence of that to overturn. Check the rule book and get back to us. Cheatriots bailed out again.