Maybe... But with Kagan-Breyer-Ginsburg-Sotomayor voting FOR it, I don’t think they meant to help the GOP.
Here’s my understanding...
By placing all the minorities in one district it overstacks the population in that district so that it waters down the minority vote elsewhere.
So what the democrats want is a district with just enough minorities to win that district and just enough in other districts to win those too. They want the best of both worlds. Racial gerrymandering when it gives them seats, but not too racial to prevent them from being competitive in other areas. They are working to rig the system for themselves (obviously) but they keep getting trapped by their own stupid rules.
Now the GOP can redraw lines so that minorities make the same proportion of the population around them...that means less minorities winning seats.
Unintended consequences here. Personally I think anything that is illegal to discriminate against shouldn’t be allowed to be considered in gerrymandering. Race, Religion, Color, etc...