I gotta say, Klopsik plays there every day and nobody ever recorded or any admin banned him as far as I know, and he doesn't seem suspicious either. I was there when you reported him and tbh his score and gameplay(the only 1 minute I was there and saw him) wasn't insane but you seemed more than sure about it, so I'll watch the demo and edit my post.
Edit: After watching the demo 3 times, there was only 1 moment with 3 kills available to jude, and besides the first kill that was by sight, the 2 others were based clearly on sound in my opinion, I could easily hear the CTs coming as well, and combining them with some fast reflexes it was more than possible to happen. I suppose the crosshair was a little shaky but it's not the first time I see such shooting from somebody clean. His movements also gave another point to him being clean considering the fact that he was walking instead of running in places he supposed CTs were hiding, not to mention him checking all the hiding spots in long after the 3 kills.
My personal conclusions: 1)The demo should've been longer, 2)I believe he's clean, but I could be wrong.
Regards.