As a former college instructor, I would never allow my students to quote Wikipedia. Because it can literally be edited by anyone, there is no guarantee that the information is correct, as with the erroneous information about PCLinuxOS on Wikipedia.
Yes, Texstar was a Mandriva user. He maintained his own separate, special repo, and just as now, its contents were well known as working exceptionally well. When Tex decided to create his own distro, yes, it was based off of Mandriva. Then, later, there was another import of Mandriva code. However, since then, PCLinuxOS is its own, independent Linux distro, so much so that many Mandriva RPMs will no longer work unaltered with PCLinuxOS. Today, you are just as likely to find code imported from O-Suse, Mandriva, *bun-tu, and every other Linux distro.
JakeLogan, please try to find better sources for information than Wikipedia. While good for many things, it's best to keep in the back of your mind that the information you receive from there may not be 100% correct. As for information about PCLinuxOS, we've ran articles in the past issues of the magazine about the history of PCLinuxOS.