I'm glad you've found the one place where dictatorial moderation and misuse of mod powers is okay, because you only saw it happen to one person. I'm not sure why you think you have some sort of gotcha point there.

The mastodon screenshot is all that is needed to prove that this guy was unfit from the start.

People like this should not receive benefits from the platform they tried to abuse. A simple copy paste of the evidence and information whenever it pops up in my feed is barely any effort.

Besides the fact I think that linking to the primary source of information is already more important than linking to someone's post about it.