If HBD is true, then all the existing correlational and longitudinal evidence immediately implies that group differences are the major reason why per capita income in the USA are 3-190x per capita income in Africa, that group differences are a major driver of history and the future, that intelligence has enormous spillovers totally ignored in all current analyses

I think you overstate the case. HBD being true would mean the differences between human groups are large enough to be important for all kinds of things. But it doesn't have to mean that these differences are so large that they swamp every other difference! There are plenty of other, undisputed differences between human groups, which are either non-biologically heritable, or are part of their geographical environment, that could contribute to or outright cause huge disparities between the US and Africa.

As just one example, if you took the African climate, and the sub-Saharan African prevalence of human disease and parasites, and introduced it to the US in a counterfactual past, I expect US average incomes would be much lower. There are many other examples and arguments I could bring here, but I'm pretty sure you can think of them yourself.

Differences in outcomes between groups in the US, or in the EU, are a much better case than the US vs. Africa or vs. China.