I suppose “evidence that the site’s leadership has permanently changed” would convince me. Whoever decided to put in the code that causes visitors to DDOS someone should never be running a web site again.
And since the site stores unauthorized copies of content, I don't expect any new leadership would be willing to announce much more than a pseudonym.
They've shown they're willing to deliberately weaponize their users to fight a personal dispute with someone, and didn't take corrective action when called out. Trustworthiness is something you lose and don't get back.