I may be very confused here, but are you saying that there are genetically separated people that have a 35 pt IQ difference? If that is true, I would love to see the source.
Lowest nations are around 70 (can be lower than that). Highest nations are around 100 (can be higher than that).
You can't just compare two samples without controlling for confounding differences.
Science can't even fully explain the Flynn effect, in which industrial nationals have had IQs going up 3 points per decade on average within the country, and people are trying to use IQ to talk about differences between sample populations.
I do agree with you that there are questions regarding to measurement issues and confounding issues. But it is hard to believe all the group differences can be explained away by solving these issues.