As long as a law is race-neutral on its face, John Roberts will make sure that it is upheld, without regard to the fact that it appears to hit one group more than another.
I don’t even think the “disproportionate effect” idea is even valid any more, after Washington v. Davis. USSC said in that case that even though a police officer test had a disproportionate negative effect on black candidates, the test was OK because it was “facially neutral” or something like that.