Fish you are now QQ'ing here.
1st demo - shows nothing of any sort resembling someone using a wall hack, fail #1
2nd demo - after he dies from someone in a particular spot, if he goes back that way, he checks those spots from then on, also a lot of the time he is sneaking in behind the ct team and killing a lot of them. no where does it look like he knows where someone is except for once, but even then when he gets the kill, in slow motion and normal speed, it looks more like a reaction shot than anything.
None of the demos so far shows any real evidence of someone using wallhacks. Actually Vu seems to be walling more than Mozart. And considering digger nick was sitting in spec basically accusing him of cheating some how, why would he continue to cheat? Sometimes people are better than you, no point in QQ'ing over it. The guy is not wall hacking, if that is wall hacking I'd love to see some of the aimbot bans.