Yup.
Anyone who keeps up with the chess world knows Magnus, like almost all the top guys, has serious arrogant douchebag personality traits. I don't keep up with the game all that closely and I've seen him smash shit, mouth off, and just generally act like a spoiled cunt.
Magnus, whether he's bored or just wants a challenge or wants to increase his chances of avoiding draws, often times plays bullshit opening lines. Usually this works out in his favor. These top chess nerds know all the main lines to all the openings super deep. So if you go into those lines the games get stale and it is hard to gain an advantage that will lead to a win.
In that game against Hans, he played a weak/obscure opening line as Black. I'm sure he figured, this idiot is hundreds of points lower rated than me, he won't expect this, I'll get an edge/he'll fuck up, and I'll win. Instead, Hans handled it, Magnus played poorly (normally Magnus has above 96% accuracy in his moves, that game he was in the 80s), and Hans won.
I'm absolutely certain Magnus was furious just because that's who he is. He hates losing. But I doubt it would have turned into anything except than Hans decided to go run his mouth and say shit like "The chess speaks for itself" and "Magnus should feel terrible losing to an idiot like me." Then, magically, Magnus is pulling out of the tournament and insinuating Hans is a cheat.
Hans did get up to some shenanigans online, but that's a far cry from cheating over the board. His rating has dipped recently to where he's around 2660, but that's pretty much directly related to Magnus tarring his name. Hans stopped getting invited to the major events which are closed/invite only. Instead, he's been running an insane amount of open tourneys. Like, he's been playing an unhealthy amount of tournaments. Any highly rated player is going to lose rating playing that many open tourneys. However, it's clear he's close to Super GM strength. He just needs to work on his consistency and not blowing up. He's like an All-Pro RB that has a fumbling problem.
There's no evidence whatsoever he has cheated OTB. He absolutely didn't cheat in that game against Magnus. Definitely didn't deserve to catch all the heat he did. Poor guy is only 20. Awkward nerd dedicates himself totally to chess, is playing well, beats the world #1, and then that guy tells the entire world you're a cheat and tries to get you blackballed. I can't imagine the stress he was under.
He's back on Chess.com as of the past day or so. Had some fun games, blundered and lost to a much lower rated player, but also one where he beat Daniel Naroditsky (one of the best bullet/blitz chess players in the world).