I have no idea how you reconcile that with the Alabama and Louisiana decisions.
Seems pretty similar to the Jacksonville split in Florida, right? And that one's been found to be fine. Under Milligan, seats are only protected if it is possible to draw a compact performing seat where an outright majority of the population belongs to the minority group in question (which is not possible in northern Florida; even if you send tentacles to Tallahassee or Orlando it won't be majority-black). If it is possible to do so in Huntsville then it may indeed be a VRA violation.