I disagree. I don't think the subconscious computes any expected utility at all. I think it's in large part a dumb set of heuristics and reflexes that isn't particularly good at 'winning' in its current environment. Sure, it's true that "subconscious mechanisms have some winning strategies open to them that conscious strategies don't", but that's a much weaker claim.

That it's using a different utility function is important to remember and nonobvious in the great-grandparent (we wouldn't say it's good to be taken over by a brainslug simply because the brainslug is better at achieving its goals than we are at achieving ours).