I have no actual knowledge. But it seems by analogy that the point is that just as closing your eyes does not make a room empty, randomly wiring a neural net does not cause it to lack preconceptions of how to play. Presumably, it has random preconceptions, but preconceptions nonetheless. There may be some deeper lesson here in that we cannot build an artificial intelligence that is "pure" in the sense of "not depending on hardware or software". --Jimbo Wales