I see claims like this all the time on HN. Where is this data supposed to be coming from? When I look it up on Google, I get data ultimately sourced from shady online IQ tests (which nonetheless purport to provide a monotonic ranking of every country in the world from China to Nauru, despite the fact that virtually none of these countries collect IQ scores from their populations).

I have no reason to doubt that China is modernizing and improving their gross aptitude for knowledge work! The directional point you're making may very well be valid! I'm just wondering how anyone could be quantifying it in terms of "average IQ", a metric that generally does not exist.