The article specifically concerned college, and IQ tests are a predictor of college success, just not a good one. For example, from https://link.springer.com/ar

The article specifically concerned college, and IQ tests are a predictor of college success, just not a good one. For example, from https://link.springer.com/article/10.1007/s11031-017-9660-4 https://link.springer.com/article/10.1007/s11031-017-9660-4 > Known predictors of academic performance (e.g., college GPA) among college students are ACT (or SAT) scores, high school GPA, and Intelligence Quotient (IQ) (Sternberg et al. 2001; Bowen et al. 2009). or from https://www.pnas.org/doi/full/10.1073/pnas.1601135113 https://www.pnas.org/doi/full/10.1073/pnas.1601135113 > This paper uses a variety of datasets to show that personality and IQ predict grades and scores on achievement tests. Personality is relatively more important in predicting grades than scores on achievement tests. IQ is relatively more important in predicting scores on achievement tests. Personality is generally more predictive than IQ on a variety of important life outcomes. Both grades and achievement tests are substantially better predictors of important life outcomes than IQ. The reason is that both capture personality traits that have independent predictive power beyond that of IQ. or from https://www.nber.org/system/files/working_papers/w18121/w18121.pdf https://www.nber.org/system/files/working_papers/w18121/w181... : > Achievement tests and grades are more predictive than IQ. But none of these measures explains much of the variation of any outcome, leaving considerable room for other determinants.