This is a weird one. You're looking at per-match Average Damage/Round plotted on a graph.
I played this player during their last 160ADR multi-game peak. I quit the match because of how blatant they were cheating. I suspect it's a south American if that matters to anyone.
I checked their stats today and that 160 ADR/match they were doing is now sub 60 (red).
I guess, I just don't understand whats causing the extreme variance. Are they playing legit or are they sharing the account? Are they deranking? Are they using a booster?
Stuff like this just perplexes me. Either way, VAC ain't catching them…