For me, this weakens Magnus's case.
Obviously there's more information that isn't being disclosed, and until the definitive information comes to light we're all going to be left in the dark.
Nonetheless, addressing this statement, it basically reveals that Magnus couldn't trust Hans before the tournament and especially the game they played in which Magnus lost as white.
Essentially, there isn't a game where Magnus loses to Hans and doesn't see cheating. He'd probably suspect cheating even if he won so long as there was some "unusually good play" from Hans.
So, excluding cheating as a possibility, the probability of Magnus strongly suspecting cheating given that he loses to Hans, however unlikely, looks like about 100%.
I haven't been following this closely (so please correct any details), but Hans's defence of how well he played in the game seems consistent with him playing unusually well and Magnus's observations. IE, Hans claims that he happened to prepare the opening Magnus played because he was trying to think of ways Magnus would play unpredictable openings, which is something, AFAIK, Magnus tends to do. It also seems plausible that Hans would prepare much more for the game against Magnus than anyone else. That combined with some luck and having a good day all seems consistent with not only winning unexpectedly but a relatively unusual demeanour.
And on the demeanour points Magnus makes, can we take a moment to imagine being him in the game: already suspecting cheating, running into someone who seems prepared for your "unusual/unexpected opening" and then being down as white ... what would you see on the other side of the board? How could you not read into any tick or gesture? Moreover, how focused are you? Would this not be the set of circumstances where you're going to play unusually badly? My vague understanding is that Magnus did indeed make some blunders in the game. The question for me is how well did Magnus play relative to his own level?
Overall, on the general point of cheating, Magnus is probably very much on point. His unilateral action on this seems on par with World Champions thinking they're as big as the game itself, for better or worse. On the specific point of whether Hans cheated in this game, I think that "innocent until proven guilty" is the only thing that will keep things together because if Magnus is wrong and Hans is bullied out of the game because of this then it will only contribute to the ugliness of a cheating crisis not remove it, IMO. That a cheating accusation is as ugly as this has been already is already a black mark against all those involved in managing the sport. Should it turn out that Hans did cheat, for instance, it's not a good look that the undisputed world champion had to or felt he had to forfeit a tournament and a game in another tournament to make his point.
Otherwise for the sport of Chess, it'd be a sad sport indeed if exciting and unexpected moments like Magnus's loss to Hans can't exist in it and the difference between "great" and "cheater" is whether you get help from a computer before or during the game.