I don’t have the data. I don’t think anyone does, but I’m sure this is not true. I say that because I look at a lot of romance and I do see white men on some books. They are in the minority of them and I’ve never seen an Asian man paired up with the black woman in a romance book. You can scan these 500+ Romance titles
I’m sure asian man, Black woman, romance novels must exist but again I’m also sure you’ll find more Black men than Asian men paired up with Black women and romance books — especially if they’re written by Black women.
I don’t see anything wrong with non-black men paired with black women in romance novels. Now, if non-black men and black women would’ve majority of the titles I would be concerned certainly, but those aren’t the books that I’m seeing, and I look at more books than most.