Seems pretty similar to the Jacksonville split in Florida, right? And that one's been found to be fine.
Point of order – it hasn't yet been found to be fine, that lawsuit hasn't yet been decided. Nevertheless, you are correct that it probably doesn't violate section 2 (the dispute is over the Florida Constitution's retrogression and partisan fairness provisions), so for these purposes it might be analogous provided that a majority black district in Huntsville is impossible to draw.
You can draw a plurality black seat that is safe D. But it only gets to like 46% black or so.