WIMP stands for "window, icon, menu, pointing device", which you have with 11.04
I think what the author is complaining about is that Unity (or Gnome3) are not what I call "windows 95" clones.
We have had this disease in computing ever since Windows 95 that every interface has to look like Windows 95. Think about it, Windows 2000, XP, Vista, Windows 7, KDE, Gnome 2.x were ALL essentially copies of the Windows 95 user interface. (Gnome 1.x was more of a CDE clone). All of these had some basic things like start bar and a "desktop" with files and program links.
So, instead of using the term WIMP, the author should have used something like "Windows 95 based" user interface.
I for one am ecstatic that we are finally moving away from Windows 95 being the gold standard for user interfaces.