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The blogger is wrong. Supplementary tables S10 and S11 [1] show IQ scores dropped as a whole (stratified by gender only). The result is statistically significant.

[1] Pages 16 and 17 of the Word document under "Appendix A. Supplementary data" at https://www.sciencedirect.com/science/article/pii/S016028962...

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The interesting part is the partial conclusion:

> The steepest slopes occurred for ages 18–22 and lower levels of education.

So they're blaming faulty education for people being bad at the test. Now I want to see the RCT to prove this hypothesis. (With controls for experimenter effect.)

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