That's exactly analogous to SF not offering algebra (for the students without the means to take extracurricular classes, which are disproportionately Black and

That's exactly analogous to SF not offering algebra (for the students without the means to take extracurricular classes, which are disproportionately Black and Hispanic) - none of them get algebra, so they're all worse off in math in the future. With algebra offered, Black and Hispanic students may be less successful on average at algebra than other groups, but at least Black and Hispanic students that can handle algebra get a chance for better math education.