He looks good. But most NBA players do in warm ups. It's about can you do it in the game.
One of the things I enjoy when I go to the games is to watch warm ups before the game starts and after halftime. You watch even the scrubs and they have perfect ball rotation and mostly a smooth shot and they can hit from threes and twos etc. But doing it against defense with pressure of time and game consequences changes the confidence in the shot.
That said, he's been a good shooter in summer league, so hopefully it translates to the big boy league.