To me, a set shot is one with virtually no lift, where the offensive player has a mechanical aim / release technique. In literally every clip of JBA shooting, he gets his legs into every shot. There is a discernible jump on every shot he takes from the perimeter -- hence why I disagree with the observation that it is more of a set shot. He's clearly taking jump shots. Where I think you might be deriving that from is that there were a few clips where he got the ball at the three point line, then sized his defender up before letting fly. That doesn't make it a set shot, or convey that he has a slow release, IMO.
There were a couple of clips where his release point looked low. But the vast majority that didn't appear to be the case. On one noticeable clip where it looked really low, it was a practice clip, and I wonder if it was the low camera angle making it look like a lower release than what it actually was.
I think that the bigger consideration is that he has a smooth shot, he's comfortable taking it, and he makes them cleanly which suggests good rotation / follow through [which is also suggested by his hand placement / wrist mechanics after he shoots]. It would be one thing if he had funky form, and was shooting the ball really slowly against smaller defenders -- that would be a red flag.
