Kidd-Gilchrist shot form is about as ugly as you'll ever see, yes. He has had a few seasons where he shot a decent percentage from 3 on a low amount of attempts (43% on 1 3 attempt per in 15-16, 34% on 0.7 attempt per in 18-19). But he's not a shooter.
I think that's fine though. The idea in theory is that he would add athleticism, defense, rebounding, hustle in the minutes where Niang is providing nothing.
Another thing is that he's a 26 year old former #2 overall pick who has been on one bad basketball team for his entire career. He'll never be a star but maybe there's still some potential there. Maybe simply being on a good basketball team with good players would change some things.