From the article: "It’s common knowledge in psychometric circles that reading comprehension tests are statistically equivalent to IQ tests" I'm not sure why t

From the article: "It’s common knowledge in psychometric circles that reading comprehension tests are statistically equivalent to IQ tests" I'm not sure why the author throws this out there, then ignores it. English proficiency is tightly correlated with SES in the US, and one of the historical criticisms of IQ testing is that it mostly tests your ability to understand the questions on the test rather than underlying cognitive capability. As a result, any conclusions about an IQ gap may be attributable to an education gap, which I doubt very many people would deny exists.