I have no doubt that IQ tests reproducibly measure the test takers ability to pass tests, as well as to perform in a society that the tests are based on.
I think it's disingenuous to attribute IQ to intelligence as a whole though, and it is better understood as an indicator of cultural intelligence.
I would expect that, for cultures who's members score below average on IQ tests from the US, an equivalent IQ test created within that culture would show average members of that culture scoring higher than average members of US culture.