The journal was linking directly to personal information and names. Weasyl isn't trying to moderate what's going on with the other website. It would simply prefer to not be a platform for unproven accusations. Just because I host a NSFW image on another site and link it into my journal, that doesn't mean I'm not violating ToS and ratings rules.
And as XoPachi said. They have the right to enforce the rule as the admins choose to interpret the rule. And I for one trust their judgement on it.