...Who uses the fleet reference? Um, lots of people.

All of Blaise Russel's campaigns do. FSPort does. Scroll does. I think Derelict does.
I agree that anyone who wants to ignore it should feel free to, without prejudice. In fact, while I tend to use fleet numbering consistent with the article, I believe that several fleet
details mentioned in that article are wrong, and I have amended those details in my own story creation. Nevertheless, that does not diminish the value of the fleet lists as a fanon reference.
So it is with Galemp's list of corporations. Galemp has used the list of corporations in some of his projects. And at the time Galemp originally posted the corporation list,
several people hailed the list as a valuable resource, including CP5670, who used a bunch of corporations in Procyon Insurgency. This was many years before the page was even added to the wiki, so it's not as if it were some draft that Mobius spouted off one day.