An Officials Official is on CBS admitting they missed the call, but qualifying with how difficult a call it is to make. And it's not a reviewable play.
All I can say is from HS experience. Back then, if the defender was moving, in any way, if his feet were not set, and the offensive player hit him, it was a foul on the defense.
It's a naive way to look at this issue, but it's a pretty simple call from that perspective. These defenders, these floppers, are always moving, always sliding into position, often after the offensive player is in the air. What's an offensive player to do?
College basketball officiating just needs to be blown up, and redone. Rules simplified. It all seems much harder than it needs to be.