AFAIK, back then there is humor that there is an individual who likely made a bot to get plagiariazed contents, from the history of every user. Well, I really don't know if its true but the fact that those reports can't be possibly done by an individual within just days or a week.

So maybe it's just a mere coincidence that they caught also some posts from long time ago, although the user's only goal was to find the new ones. But still the punishment are still within the mods jurisdiction so they're really the one's whose questionable here and not the user who made a lot of reports (JMO)