Sounds to me like the Court has just made the Voting Rights Act a dead letter. Since the Congress will never agree on how to redo the map, it will just sit in a corner and gather dust like a buggy whip.
That seems to be the trend on the Court. Tell the other branches (and by extension the voting public) that they need to live with and deal with the messes they create.
It was also the underlying rationale for Roberts’ (wrongheaded) ObamaCare ruling.
Only the preclearance part. Section 2 of the VRA, which allows for individual lawsuits claiming a violation of voting rights, is unaffected by this decision.