Would the main partisan impact of this be taking the black majority areas out of SD-11 and SD-12? I can't really see anything else on the map that would change in any meaningful way.
They can make either SD-1 or SD-2 closer to black majority at the expense of the other, but that doesn't really change either away from Safe D (not even close really).
No, the black areas are very small portions of SD-11 and SD-12. It’s likely they touch districts like 1, 2, 3, 6, 7, 8, 10 more, all of which have large black areas yet none are black majority.