I don't believe its true, I believe it should have ended with, "you become a player, enjoy the game". People that believe otherwise are just deluding themselves. I believe that good designers can be good programmers and/or good artists. They may not be the best in those categories but to design what they want they have to know how it can be accomplished.
The number of water cooler game designers is immeasurable.
I would agree on his assessment of Chris Roberts though, of himself I do think he was truly innovative when the media was young but I am not so sure now.