I'm not sure why people think these numbers will result in dems losing less seats in redistricting. You can still do 10-4 GA, 11-3 NC, 26-12 TX, 20-8 FL, 13-2 OH, 9-0 TN and so on. You just have to shift things with populations changes but you can still draw out dem incumbents and put them in safe R seats.
9-0 TN isn't possible. Even though Steve Cohen is white, his district is over 60% black and VRA protected.
No guarantee that the Supreme Court will stop it. Roberts, the supposed "moderate," hates the VRA with a burning passion.