The site lists Descent 3 as being the first to have procedural texturing and yet Unreal had it in 1998.
Doom is only listed as "first game to present panoramic skies". Doom may have been the first to have ambient lighting and built to be moddable. Probably also the first LAN-based multiplayer 3D first-person shooter.
Quake is only listed as "advanced 3D first person shooter" and yet Quake had many technologies that were probably firsts as well. First ip-ip client-server 3d first person shooter, first true 3D environments in first-person shooter, first to use pre-generated lighting in combination with dynamic lighting using a surface cache, and probably more.
I may have some of these wrong, but you get the idea. The site is missing a lot.