Exactly. I was about to post the same thing. I am responsible for no less than 160 Linux desktops, laptops, and servers at work, home, family, etc.. Not a SINGLE one of them is using Gnome desktop. And based on a rough estimate at our Linux/Unix user's group, I would say perhaps less than 10% use Gnome on any of their machine.
Now, if they said "popular" desktop or something, fine. But "primary"??? Give me a break.