Sorman says he regrets not having reported Foucault to police at the time or denounced him in the press, calling his behaviour “ignoble” and “extremely morally ugly”.
As someone who went to a school where one particular teacher's pemchant for young boys was an open secret that none of the other staff ever thought to do a damned thing about, I can't say I'm terribly impressed by these "regrets" after the fact.
The problem with leaking what is effectively gossip like this so long after MC's death is that it will be very difficult to prove. Short of the boys concerned coming forward and describing what happened with some degree of consistency, I don't know how anyone would do that. Maybe I'm wrong and Sorman has well documented evidence to back up his claims. I hope so. But I can't say I have a lot of time for him failing to do anything about it when it could have been properly investigated and dealt with, and then claiming to be so outraged now that it can't.
However with paedophilia being the highly emotive subject that it is, most people will just judge MC guilty anyway. Eg this thread.