This shouldn't be shocking to anybody paying attention. Folks have let it be known quite loudly how they felt about both candidates on the ticket for years now. If voters feel like they are being ignored or not heard, even after stating their grievances well in advance, you can't blame a few of them for checking out on the process. I think the last part, "checking out" is the thing that needs to be remembered here. For the overwhelming majority of Black voters who aren't feeling this election, it's coming down to Biden vs not voting, rather than Biden vs Trump.