His ping isn’t the thing in question. The point is that the clip is an example of questionable play on his part.
Also, while looking at As MGE server stats I noticed that he has the highest point total of anyone on that server by ~11,000 points. The main part of this that looks sketchy to me is that the person in second place is yaima (who I’m pretty sure is the same person as blackymonster, who was hacking), despite having 3 less hours on the server than yaima, and spending a decent amount of time doing nothing in badlands middle because nobody wants to play against his crutch loadout. I also visited his gametracker page and I doubt that he got good at TF2 by frequenting Hightower and 2Fort.
Basically, the deeper I dig, the more suspicious he gets.