Comment by mlsu

If P successfully produces the relevant behaviors of O (burning, light, etc), then P is an implementation of O. There's no separate "real O" floating out there that P fails to capture. In other words, when you are playing the game, there _is_ fire involved.

You define a 'real' implementation to exclude computational substrate, then use the very same definition to prove that computational substrate cannot implement 'real' implementations. It's circular!