The celebrity endorsements are part of the story, but the media has largely done a piss poor job in framing what happened with various groups in this election.
Like, it isn't debatable that Trump will end up doing better than most GOP candidates in our lifetimes with black voters (going from winning 7% to somewhere between 10-12%), which matters a lot in terms of electoral politics.
But somewhere along the way, this morphed into "Trump is wildly popular with black voters." Which seems to have lose sight of the fact that a candidate only winning 12% of a group is still, by any definition, getting rinsed.