Recent results in Georgia seem to offer some credence to the author's view, it is not a new one, DuBois was arguing the same at the offset of the last Century, power came thru political means and his talent ten would start with recognized black politicians.
It would be difficult to determine if results in Georgia was due to recent migration of black voters given probably just as many nonblack people migrated at the same time, but organization among the black populace did lead to the Democrat victories
Migration is always more about economics than race, no question the Southern seemingly purple States and Arizona are due to migration, and it will continue, much to the disdain of many native residents
Read a big article on USC football in the Times yesterday (
https://www.latimes.com/sports/usc/story/2021-01-09/clay-helton-usc-coach-football-future), seems some are enthusiastic about what lies ahead