Yeh..soz for the long demo.
Please watch again the demo one more time, I should have pointed to you specific time that I think he was hacking.
Watch it at 1/4 speed & fast forward the demo to these timeline:
16:13 - 16:45 - Proof of wallhack - unless you can explain to me how he shoot the green line accurately most of the time.
23:30 - 23:45 - Proof of anti-flash - he managed to kill 2 people at the stairs when he was fully flashed.