You can reduce an AGI to the behavior of computer chips (or whatever fancy-schmancy substrate they end up running on), which are themselves just channels for the flow of electrons. Nothing mental there. Friendliness is a description of the utility function and decision theory of an AGI, both of which can be reduced to patterns of electrons on a computer chip.

It's all electrons floating around. We just talk about ridiculous abstract things like AGI and Friendliness because it makes the math tractable.