Just watch Coby's top 1/4 of his shot, then it seems more clear.
Trae Young's is low too, and his issue is that he barely gets his feet off the ground which makes it seem lower. Coby, credit given, gets a good foot higher in his jumping form than Trae. But strictly the release point, not the follow through, Coby's hands are inches away from his forehead. Someone like Trae pumps low, but the actual release point is very high.
I know, I know.... pictures, but here is what I mean.
I found a bunch that were like this from Trae, and his actual release point is not a concern.
Wow, hard to freeze frame that fast shot. But this is his actual release point, consistently seen across many shots. I cut his lower half out, because when you see his him getting air, it hides a lot of the flaws.
See what I mean?
Then here:
**Mind you, this was a catch step and shoot with a lot of momentum. It's the highest release of his shot arsenal. Momentum + mechanical flaw means very little to a microwave shooter, they can always get into a rhythm and not worry about shots getting contested. Being out of a rhythm and getting back in is the hard part, at the NBA level /removes captain obvious cap
An NBA level shot blocker can time blocks if they see that window of opportunity. Coby has a lot of great mechanics with his shot, but when you get air PLUS have a low release point, your counter window for adjustment is TINY. A guy like Trae, as much as I hate flat footed shooters, they can fake and adjust considerably quicker.