I'll add another layer to your analysis. There's the idea of black men as sexual beasts, less moral but more sexually ravenous, and thus, the woman will be more satisfied by them despite herself. This has two roots:
1) regardless of race, men with long-term stability are more inclined toward monogamy, whereas more impoverished and uneducated men are more sexually opportunistic. Thus, lots of single moms in both trailer parks and inner cities. However, racism makes this intrinsic to the race rather than a product of socioeconomic circumstances, which there's no evidence of.
2) this fed into an idea in 19th and early 20th century (pseudo)scientific racism, which you still find repeated by modern racists. The idea is that some races of humans are evolved toward
quantity of offspring, as are mice and bugs, whereas others are evolved toward
quality, as are, well, humans. The "quantity" races are sexual maniacs with big muscles and giant cocks, whereas the "quality" races are boring monogamists with skinny bodies and dinky little penises. (Unexpectedly, this school of thought puts white people in the middle, with Asians (or rather, "mongoloids," ugh) and Jews on the other end of the spectrum.)
Now, this idea is actually based on genuine biology, but has a fundamental flaw, the deeply stupid assumption that everything you see is due to genetic differences between races. (Remember the old stereotype that Asians are short? That's kinda faded, because Asians are no longer short due to improved nutrition.) There are many well-documented reasons why the legacy of slavery and segregation are propagated down through the generations - just the fact of black kids growing up in poorly funded schools and breathing lead-laced playground dust is a strong starting point. My point is that humans are humans, race isn't biologically real, but class very much is real. End woke rant.
I find Blacked, the brand, quite odd/interesting in this context. They produce really classy, non-racist content built upon a fundamentally racist fetish. From the producers' side, I suppose they want to make a living within the market as it is, without propagating racist ideas. But it's interesting that it's a hit with consumers as well, and I wonder if that's because they like the trying-not-to-be-racist storylines, or if they'll just take whatever black-on-white porn there is with high production values.