Anonymity might help him to avoid criminal prosecution (if anonymity is breached and if there were indeed any crimes commited), however it does not help at all with keeping Limited Liability protection. That's what I mean.
BTW. Most people do not have any clue on how difficult it is to stay anonymous on the net, particularly when there are allegations of crime thrown around.
I suspect that this is the reason for his very minimal contact with the community. The more he talks and communicates with the community the higher the risk of his ID being discovered.
There is also how he has paid for his hosting, unless he is paying for his hosting with bitcoin (which is very possible) and he has not bought the coins off an exchange then the credit card can be traced back to him if it's a personal one. There is no such thing as anonymous banking in this world, so that if the credit card is registered with his company he will still have to provide an identity.
It may be difficult and even costly to track him down but it can be done...unless he's a government agent in which case all bets are off as the state (whichever one) would provide protection.
A court order can be obtained in to reveal his identity in the region that his LLC is incorporated.
Nefario.