the correlation between IQ and life outcome looks like a hidden-variable measure of social acceptability
This would mean the IQ scores are meaningless for cross-country comparison. And that just aint' so.
That's not what that link says - best I can tell, the book summarized states living in a high-IQ country is more predictive of good life outcomes than your own IQ.
Getting down to brass tacks, we are assuming a lot when we compare IQ numbers from different tests. WIAS-IV is not necessarily comparable to other tests in English. Assuming that the French language test measures the same thing as the WIAS-IV assumes the very conclusion that I'm not agreeing with. (Although I'm not arguing this point in our other discussion).
Another month, another rationality quotes thread. The rules are: