In those emails, SA does not say he thinks these questions deserve more study -- he says they're "probably partially true". Again, in that context he's talking about Steve Sailer's views.
Yes, I'm focusing on a few sentences. Do you think he wrote those by accident? That the words came out wrong and the straightforward reading was not his intent? In the context of the rest of his emails, and his writing on e.g. Albion's Seed, I do not think that is likely.
And on a final note, I'd suggest you read the last paragraph of the screenshotted email chain, where Scott explains how it's valuable to read creationist arguments it forces him to sharpen his thinking.
> You never realize how LITTLE you know about evolution until you read some Behe and are like, "I know this correct... But why not?".
> Even if there turns out to be zero value in any a Reactionary has ever said, by challenging beliefs of mine that would otherwise never be challenged they have forced me to clarify my thinking and up my game.
I really think you've lost the forest for the trees here. Scott is praising certain parts of reactionary ideas for asserting things most people wouldn't argue, and those interactions are leading him to sharpen his thinking.
Scott is acknowledging that the taboo to even recognize these disparities is counterproductive: it stymied attempts to improve schooling or studying practices, because it's taboo to even recognize that there is a difference and instead people typically allege that the tests are biased. Would Scott argue that with identical environmental factors we'd still see the same disparities in IQ across ethnic groups? I don't think so, and nothing in the emails linked seem to suggest this.
1. https://www.brookings.edu/articles/analyzing-the-homework-ga...