Of course there were black confederates! Even as a Northerner I’m perfectly fine to admit that! New Orleans had a number of them alone.
But yes, the typical loud-mouth lefty black professors are the obvious go-to nutters to try to declare it fake.
I await their well-researched book on the subject. *crickets*
I suppose the records of free Blacks actually OWNING slaves are all part of a vast right-wing conspiracy to rewrite history too?
And lest we forget the history of slavery in America - and where those slaves came from - many of which were captured and sold into slavery by their own people...