There was an instance of prefire, there was a part where he shot at a teammate without knowing his location (end of round, probably just using the radar, right?), there was a point where he showed good use of his sound system.
He didn't show too much skill overall, and his aiming seems artificial(strafe into the shots, not reaction shots). Also there was a scene where he aims through the wall for a second or two. Suspicious for the duration I observed, but not 100% conclusive (for as long as I watched, I should watch more.)
I would be highly suspicious of him and wouldn't be worried if he was banned at all.