This is all very interesting...
Not because of NeoGAF supposedly faking something, but because I know for a fact that the information came from the official E3 website. I'm not a member at (or is it "on"?) NeoGAF, but I often browse it because they get information very early and react very quickly. And the thread where the floor plans were originally posted also contained direct links to the E3 website.
I can only think that Dan Hewitt is referring to the (presumably) fact that it's an incomplete list, and still subject to changes. The attempt to cast it as "THIS IS FAKE" is the curious part.