If it is ok to eat less intelligent things then if you know for certain that a particular human doesn't meet the criteria (infants, for instance), why are they exempt? No testing need be performed. We know that the category of "infant humans" is going to have an IQ under your stated limit.
You are not making rational logical arguments. You have started with your preferred conclusion and are employing rationalization to justify it. Every time I show you that your philosophy allows for things you find uncomfortable, you move the goalposts.
Case in point:
>Also, discussing whether or not I would eat a human is silly because I can't go to the supermarket and buy human flesh. So, let's keep this discussion away from meaningless hypotheticals.
This is a copout that means "I am afraid of what my philosophy actually means, so let's just ignore it". You could easily acquire and consume an infant if you wanted. There'd be severe consequences for doing so, of course, but that doesn't mean you can't do it. People do do it. None of that is relevant to the question of whether or not it is morally permissible to do so, now is it?
But you, you're not interested in making sense. You're uncomfortable, so you rationalize. Oh, it's not ok to eat infants even though they're well below my IQ threshold, even though it's completely possible, because they aren't sold in the grocery store!
Please.