This guy has never been GM before and then they just decide that he should be by making his character so broken that he doesn't have to do anything to get better except play the stupid character. Same thing with Mercy last season. Literally had NEVER been higher than like low plat Mercy mains every other season in masters without doing anything.
No offense to this guy. Congratulations on GM and all that. It's not his fault or diminishing his skill or anything like that. Blizzard just doesn't reward higher skill enough.
EDIT: Like for example. Seagull on stream said "I'm just going to sit here and spam (with genji) until someone is randomly 1hp from Junkrat and then dash in and out." Why would you encourage that gameplay? It's just people mindlessly doing nothing until someone gets lucky with like "skill" in that everyone shoots in the general direction of other people.