I'm pretty sure that by definition a difference between populations cannot be heritable
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Nah. Depends on how you define the populations.
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if you calculate it with two populations, they become a single population at that point, and if the environments are different, that changes the heritability too
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I think this is crossing heritability in the traditional biology sense (passed down via genes) with the way it's used in things like "heritability estimate" (within pop statistical value that says nothing about genetic causation).
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Yeah, I believe the guy in the screenshot is intentionally playing on the ambiguity (equivocation fallacy) in order to confuse people. I'm sure he knows the difference but is misleading people.
Most of them are themselves confused. They really don't understand the statistics well enough to know the weaknesses in the methods.
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