It's much more nuanced than this. Magnus said that there's more he'd like to say but he'd want Hans' permission to speak openly - https://twitter.com/magnuscarlsen/status/1574482694406565888
Just because he can't immedially dump all the information that he has doesn't mean that he's obliged to keep playing chess against someone he believes is cheating.
> he's obliged to keep playing chess against someone he believes is cheating.
No one is obligated to play anyone, that much is true. Magnus has gone quite a bit further than that with his statements.
It's much more nuanced than this. Magnus said that there's more he'd like to say but he'd want Hans' permission to speak openly - https://twitter.com/magnuscarlsen/status/1574482694406565888
Just because he can't immedially dump all the information that he has doesn't mean that he's obliged to keep playing chess against someone he believes is cheating.