I could be wrong, but I think the issue is that Alabama has no problem redrawing the district lines for majority white districts and even breaking them up but won’t do so for the majority black district even though it would be rather easy to do so. The argument seems to be that by not doing so, Alabama is diluting the voting power of black voters in the state. From what I gathered the Supreme Court (maybe? lol) said Alabama didn’t have to redraw the districts because it was too close to the midterm election, not because the case had no merit. Or at least some of the justices did.