"The Democratic presidential nomination will be determined by black voters."
Indeed, anyone-but-Trump desperation seems at least as widespread in the Black community as among white liberals, understandably given Trump's overt racism, which gets in the whole world's face every day, unlike Biden's congressional record or BAR's painstaking analyses of how bad he's been for Black people. So, if garbage polls and the Democratic press can convince Black voters that Biden's best able to defeat Trump, he probably will get their votes in the primaries.
Biden's superior electability is less and less defensible, however, because his dementia, early or late stage or somewhere between, becomes more evident every time he opens his mouth. And despite Trump's world-class horribleness, he's not showing signs of dementia yet. Trump would make mincemeat of Biden in one-on-one debates, so if Democratic elites engineer his nomination, I can only conclude that they'll be happy enough to see four more years of Trump. And they'll certainly be happier than they would with Trump's most fearsome challenger, Bernie Sanders.