ok saw the demo, you don't really have much skills ingame, I was concerned about the smoke shots where you couldn't see the enemy and then the shot after a box. From the second thought it doesn't proves much, but as you say you were banned on another server then there should be another demo.
Otherwise I would apologise to you and keep you playing. although I had to have longer demo on you by all fairness.
I think I banned around 5 cheaters in 20 min time so your nick and your gameplay was suspicious.