Are you sure that you're looking at the right Wikipedia page? I was curious about the GP's claims, too, so I checked out the reference. I don't see the content warning that you're talking about, [snip]
It has the "content warning" right at the top of the article:
This article is written like a personal reflection or opinion essay that states the Wikipedia editor's particular feelings about a topic, rather than the opinions of experts. Please help improve it by rewriting it in an encyclopedic style. (December 2007)
It's the boilerplate from "{{Essay-like|date=December 2007}}" according to the Edit page.
For the record, I do use and prefer KDE, but every copy of CentOS 5 or 6, since it's the default. I do have some CentOS 5 servers where I use KDE inside of VNC. But the KDE that's part of CentOS 6 is very unstable in my experience with plasma-desktop crashing frequently.