Between the lead and the point of contact were two other players who were uninvolved in the collision. He was triple stacked. I don't think he even had a look at the play....he was guessing (and got it wrong). But, it was a secondary defender so, the lead must have been right since it was his primary (or coming towards him).
Yes, i know, the defender was actually still outside the paint (certainly not under the basket) when the contact occurred and had actually come from further outside, which means the L didn't even have coverage of that player at any time from his position across the paint.
Plus, the offensive player was not airborne, so the under-the-basket rule, if it had been in effect, would have not even mattered....its purpose is not relevant to a dribbler curling through the lane and not shooting.