He is clearly cheating.
I just changed my resolution to 800x640 in to Software mode and ran a local server with the map jail_moviecik_v4 - The cylindrical connectors between the cells do not appear transparent. Even if they did, that would not explain why he cannot, and did not, shoot the terrorist running across the top cylindrical connector. They are the same textures, and would all be affected equally. He just chose not to fire in that instance.
He makes no attempt to hide it, and has given two false explanations for shooting him through walls. He says he can see his head - which you can't. Then changes his explanation to Yugis explanation of resolution and software mode - which is still bogus.
he`s face was on the pipe and i was shooting everywhere of the pipe and just with luck i was kiling him before he be crazy guy
His face was on the pipe? No it wasn't. You were shooting everywhere? After a few rounds you were, yes. When the demo first started you looked directly at him and shot him dead where he stood.
My suggestion would be - Be honest. Admit you were hacking, and maybe (when the time comes) your unban appeal may stand a better chance of being accepted.