But the story still makes sense, doesn't it? If anything it now makes more sense in Foundation, where there is famously almost no mention of women in the books

But the story still makes sense, doesn't it? If anything it now makes more sense in Foundation, where there is famously almost no mention of women in the books despite them presumably making up half the population. I googled dwarven skin colour in LOTR and apparently it's not mentioned in the books, so I don't see any problems with a black dwarf.