I certainly agree racism gets overemphasized as the sole cause of disparities compared to other factors like culture, economic status, and selective immigration (I don’t see how racism explains, for example, why the children of Nigerian immigrants outperform those of Mexican immigrants, or why Asians outperform whites).

But even conceding that racism is the dominant factor in performance differences, the framework proposed here is plain ridiculous. In essence, what they’re advocating is that because disadvantaged groups underperform in advanced math, advanced math should be scrapped altogether in public schools. The effect of this will be to handicap disadvantaged groups even further, as they’re less likely to attend private school or have access to private tutoring, and thus will be locked out of advanced math entirely while advantages groups continue to receive advanced math instruction in private schools.