> If the opinion is meant to be just another opinion, then it shouldn't cause any blacklisting of any sorts anywhere.
I agree with this! The registrar should not have triggered a suspension because of this. They're not obligated to, and the two processes should be decoupled.
The registrar should ignore reports of abuse, especially if coming from an authoritative source with vast resources that's been collecting reports on its own?
No.
The source should be more careful. It's the equivalent of a renowned newspaper printing warning a restaurant being unsafe to visit. Should the customers' willingness to visit be magically decoupled from this opinion?