@Justicar
Again, I refer to the fact of being able to run a city of 1 million people over 2000 years ago.
I can think of no greater practical proof. It requires architecture, engineering, construction, sewage control, water management, food import, codified law, policing & defense, and a shared virtue ethic that unites the populace.
You can't fake that. Rome also required high IQ, it's not a fluke.
Current day? We simply don't have accurate knowledge about their current capability (cont..)
@Justicar
I don't set much store by IQ tests, despite scoring highly myself.
The real proof of any civilization's intelligence will always be found in the collective fruits of their labor - their cities, technology, art, philosophy, religion - not in an IQ score.
They are entering into a period of flourishing, and we will only be able to truly answer this in another 50 years or so.
I think people 50 years from now will look at your assertion that the Chinese are not high IQ and laugh.