Really? A racist model take the base IQ of africans, compares it to that of eurasions, notices that the latter is ~2 std devs higher, and predicts superior achievement by eurasions. You would only expect such over-achievement if Asian immigrants were average folks and African immigrants were the cream of the intellectual class, but why would I predict that, a priori?

Why are you so confident that even most racist models would predict this? Prior to acquiring domain specific knowledge about trends or immigration policies in the United States it doesn't seem especially likely. Until Randaly provided the relevant link I knew next to nothing about the particulars of which racial groups successfully immigrate to the US at which education level. In the absence of such information it seems reasonable to guess that the patterns would tend toward following the trends for IQ among the groups as well as correlating with the distribution of educational qualifications for individuals in the respective countries. ie. I'd guess that East Asian groups would have more educational achievement than African groups. I'd call the model possessed by myself of the recent past wrong and also ignorant of that and related pieces of trivia but I'd hardly call it "really badly broken". Perhaps you consider this and related information far more important or fundamental than I do?