I see some good kills, and some lucky kills, but nothing that an experienced player who knows the hiding spots on a map couldn't do. He shoots where there is nobody quite often, and there's no following behind walls. Beyond this he is actually surprised a couple times and killed. When he is on scout, he could have very easily made that first kill, but he clearly misses due to a slow reaction time.

I'd say there is no conclusive evidence of wallhacks after watching at low speeds with and without wireframes enabled and disabled through different passes of specific kills.