No idea who Hill is but it's the internet and pseudonyms are a thing so for all I know maybe. And they, not being on the internet anymore, haven't said anything on the subject. Initially all I'd heard was that they got harassed out of the industry, then later someone asked about why Zak S was so disliked and he came up in connection with said harassment.
But I will say that not telling his followers to "Destroy", especially sans context, would probably be a good step towards not having them go harass someone en masse, whether or not that was the intention. It's not like asking all your friends to gang up on someone in an online argument is good form to begin with. And if people do go further than he wants them to, calling them out on it when it happens and disowning them if they keep it up would also be good steps. It can be hard, I know, but just saying "please don't do this" doesn't carry much weight if you never actually back that request up.