Yes, because he's far too professional to do that without ironclad proof.

And even if he had ironclad proof, he might still not go public.

He has done absolutely everything you can do to accuse somebody without actually crossing the line into directly accusing them. His meaning could not really be more obvious.

(My bias: I think Hans' analysis is pretty dubious, but if it were anyone other than Magnus I would give these accusations little credence. I think we who are not in the know should be giving Hans more benefit of the doubt than people generally seem to be giving)

I'd say the video attached to this tweet is rather clearly insinuating some accusation though I haven't been following this saga.

Withdrawing from the tournament is the loudest accusation you can make without words. I'd rather believe Hans on this https://youtu.be/GSLM1K6O6aU?t=1507