If you don't like that link - which is just one of the many I got when searching for 'national IQ average' there are many other similar studies to be had. Here's a few of them, again just some results from the first page in my SearXNG instance. The results are not identical but they are comparable.
(1) Several surveys backed by anonymous online "IQ test" web sites.
(2) Richard Lynn, whose numbers are essentially fraudulent.
(3) Emil Kirkegaard, the famous Danish white supremacist.
The counterargument is very simple: countries don't generally do IQ surveys. Most people on HN have never been asked to take a calibrated IQ test. The data simply doesn't exist.
(1) Several surveys backed by anonymous online "IQ test" web sites.
(2) Richard Lynn, whose numbers are essentially fraudulent.
(3) Emil Kirkegaard, the famous Danish white supremacist.
The counterargument is very simple: countries don't generally do IQ surveys. Most people on HN have never been asked to take a calibrated IQ test. The data simply doesn't exist.