Cause they can't put anything on the internet if it isn't true.
This is a video of a rager. You shouldn't post your Profanity laced rage videos here. You had a lobby with lag in it.. for all you know.. cause by You. Playing, streaming to Twitch, doing God knows what else... could have been seeing lag spikes on your end. Or possibly just got into a laggy lobby. But 90% of the deaths you took on that video were legit. You can't come here and name and shame (put these people in the video out there and accuse them of cheating).
I noticed you didn't complain the numerous times you took damage and didn't die. Does that mean you are using a lag switch?
We all get in laggy lobbies from time to time. Still seems like you played pretty well, considering. Sucks to lose those types of games. But you were using an SMG and many of the hit markers and weird incidents occurred at range, not unusual even in HC, coming from a HC Only player.
If you think this is cheating, report in game. This video only makes you come off as a complainer, and violates several CoC rules.