I'm on the site pretty regularly and the name given for one of the offensive posters is completely unfamiliar to me. I also suspect a set-up. How long was that person a Freeper? I am very suspicious that a percentage of recent Freepers are trolls.
There are many thousands of regular posters on this site, and it's possible to post in entirely different circles for years. For instance, I read daily since 2004 and post frequently, but never recall having encountered you or your screen name, even though you joined just a few months after me.
You can search individual posts several ways. With a few clicks, I found the join dates of the people mentioned in the article: two joined on different dates in 2000; two joined on September 11, 2004.
It might be a red flag that two joined the same day if not for the fact that it is a significant day for us, so that proves nothing at all. Other than that, one of them posts a lot of vanities. That's annoying; but without reading his/her articles word for word, it's not necessarily significant, either.
If you want to make suspicious claims about other FReepers, do your homework first and go back through their posts. Otherwise, keep it positive.