Uh... drawing a political district on the basis of race is quite expressly illegal in the United States. What is newsworthy here is that it's a pretty clear smoking gun that that is exactly what was happening.
I agree that that is disgusting.
https://www.npr.org/2018/01/14/577969855/gerrymandering-in-m...
(Nor is it the only story NPR has on gerrymandering in Maryland, by the way - merely the most recent one.)
But what we have here is a guy with a bunch of analysis based directly on racial data, and a bunch of emails detailing specific plans and concerns about racial demographics. In this one case we know the relevant boundaries constitute a civil rights crime.