This is the whole point.
People are treating this as proof that the demo itself was a faux when that doesnt seem to be the case.
The problem here is that people were treating a graphics demo as a full game. I'm aware that a small demo may run, but I'm also unwilling to say whether or not it is faked. It doesn't matter, at the time the developers said what was in the demo was possible.
In the end it wasn't. It doesn't matter now but it is something people should bear in mind when they see demos.