No. Fuckin stop it. Its unbearably stupid.
Historical fiction has existed for a long time.
Y'all ain't out here throwing a pouty parade when someone adds technology or magic or monsters into historical fiction.
But black people? Existing? If that's where you draw the line, it's really clear why. Make all the excuses you want.
That's literally just a longer way of saying that it's okay if it's magic but it's not okay if it's black people.
& yeah, I'll hold my breath for people getting equally upset about white people in fiction. Any day now. I'm sure.
I can't disapprove a hypothetical, I guess, but a hypothetical isn't proof of anything either.