Well, There are few weird things.
1. There is a moment when he shoots 4 bullets from his Deagles, but I think it has been caused because of lag.
2. On the end of the demo Flamed says that he didn't miss, but he does. On long range his aim sucks, but when he is close to his enemy he didn't miss. It could be some kind of hack for a short distance, but In my opinion it is bullshit.
This demo doesn't show clearly that he hacks. Just a pitty.