At the time I wrote the comment I recall some piece of evidence that I thought countered this very low positive correlation enough that it made sense to say "zero net evidence" but I honestly don't remember what my reasoning was.

That's reasonable; that you were mentally weighing up Nisbett's claim against conflicting evidence hadn't occurred to me.

We should note btw that the existence of a positive correlation with skin tone doesn't mean some of the IQ gap is genetic.

Wholly agreed.