Yet according to that chart, shooting 35% from that zone is more efficient than 50% in the circle. I'm not sure about that rating system.
It's accurate so far as it goes. 50% at the rim is pretty close to a baseline number - those shots should be highly efficient since they're taken so close to the basket. The 35% is from a few feet away in floater range, which is generally quite difficult to score from since presumably there's at least one defender (probably a tall one) between you and the basket. 35% on shots from that area is actually not bad measured against the average player, although obviously not excellent. It should be a shot of last resort most of the time for most players though, so no big deal. Besides, his overall true shooting percentage is 53.9%. I expect he'll do fine.