The black vote in Richmond and Norfolk won’t be 99-percent Democrat this time. I think you can anticipate at least 20-percent shifting over to Trump. NOVA is a different kind of situation....and locked into place with the Democrats for the next hundred years.
The people who count the votes decide where the votes go.
If 20% show up to vote and 5% of them go to Trump but 60% get reported and 100% of the new 40% went for the Democrat, there you go.