ohh.. Clear as a goat's meat.
When watching w'out wallhack, you can see quite many shots with no possibility for pure player, and with wallhack you'll notice that he's a dumb wallhack user at all.
But, perhaps you shouldn't be that quick to judge him. I agree that there are some suspicious parts in that demo, but everyone can trow away a lucky shot. After all there are many parts of that demo where the player slowly crawls around corners, to the edge of roofs etc to look around/down when there isn't any enemies at the specific place. Why would a player do that if he can see through the walls?
About that quote, I speceially like this part: "and with wallhack you'll notice that he's a dumb wallhack user at all." So you claim he isn't good seeing through the walls? Now I can't watch it through a wallhack since I don't have one on my computer but consider the fact that he isn't looking through them. This demo won't stop me from playing him or his clan, nor would I base a banning on it. I'd like to see some more.