Had a somewhat similar experience recently. About a week ago, I played with an Azmodan who was either boosted as hell or was 100% trolling and throwing.
By the time the game ended 28 minutes in, he had 103 stacks. When we brought this up, he basically said “shut up, I have a 60% winrate and I’m diamond, what are you?”
Turns out, he wasn’t lying, his account was definitely Diamond and he had a 62% winrate on Azmo with over a thousand games played. Pretty impressive, if not for the fact that he was absolutely useless in that match.
Seriously, I had more siege damage than he did, and I was playing Imperius. Do you have any idea how bad you have to be to have worse siege damage than Imperius as just about any non-Healer?
And that’s not even considering the fact that he had more deaths than he did kills and assists. Azmodan is easily one of the safest heroes in the game, and he has a ton of ranged poke to earn him kill participation. How do you die more often than you participate in kills as Azmodan? Do you afk shove a lane? In that case, how would you have less siege damage than a god dang Imperius?!