clinton got ~270,000 votes in 2016 and about 40% of them were black, as per the previous calculation. so, she got ~ 108000 black votes.

with 99% reporting, it looks like biden is going to get less than 260,000 votes and about 35% of them were black. so, that's ~ 91000 black votes.

you need to make up margins of ~20000 to win these states back, not lose them.