Fixed. There have been a number of game demos for consoles that consisted of part of the game (the beginning or elsewhere).
It's a perfectly fine way to construct a demo but, depending on the game, it's sometimes better to have the demo be somewhere in the middle of the game and it's hardly Molyneux idea. I can't help but think that his reason for saying this is so that future demos that do this are credited (in idea) to him.