Apparently I can answer my own question well enough from one recent study:
In order to offer contemporary porn references and some idea of the breadth of videos
that are being tagged as cuckold, I have put together a brief empirical section. Obviously,
this is by no means an exhaustive analysis of videos considered cuckold porn. But it does
capture the first pages of results on one of the most popular streaming sites, and hopefully
gives some credence to the textual analysis that follows. I went through the first 100 hits
on XVideos that appear with the search ‘cuckold’ (XVideos 2018). As per the heteronormative
search function, these only bring up videos tagged straight (gay and trans videos are
excluded unless the search is coupled with a gay or trans term). Of all the videos, only 67
were ‘traditional’ cuckold videos depicting an on-screen cuckold, his partner, and a cuckolder.
Within these, a white cuckold was depicted 66 times (the only non-white cuckold
being Indian). The cuckold performed unequivocally queer acts in 19 of them – usually
a clean-up of his partner’s vagina or mouth-to-mouth cum-swapping, but also a few blowjobs,
rim-jobs, and a facial. One-third of the videos did not depict a cuckold. The implication
might be that cuckold is the camera person, or perhaps the viewer, or maybe
some of the videos appeared due to lazy or clickbait tagging. A small number (three
videos) depicted interactions between a putative cuckold and a dominatrix.
In terms of the cuckolder’s race, the ratio was 67:25 black to white (46:17 in the ‘traditional’
videos), excluding the compilation videos which depicted both black and white
cuckolders. In the 30 videos without an on-screen cuckold, the putative cuckolder was
usually black (21 videos), and in eight of them he was white. The female partner was
white 96 times (65 of the 67 ‘traditional’ videos). In the other four, three were East
Asian and one was Indian. Tellingly, black women were never depicted as partners of
the cuckold; the only black woman appearing in the surveyed videos joins in with the
black man (her partner) and the cuckold’s white wife. Some of the ‘non-traditional’
videos included one tagged ‘reverse cuckold’, featuring a man and two women, one
gagged and bound – all of whom were white. Others were simple male–male–female
bisexual videos with no humiliation element. Four were labelled ‘mom cuckold’, where
a young white woman watches her ‘mother’ have sex with a black man. These seemed
to have no humiliation element, either.
Twenty-one of the videos featured white-on-white cuckoldry. With race not directly at
issue, these videos make up the ‘difference’ between cuckold and cuckolder in their physical
attributes (the cuckolder is a stud, the cuckold is not). In five of these videos, there was
reciprocity in the appearance of the white men, and these might be better classified as the
typical male–male–female bisexual porn mentioned earlier, with no performance of humiliation.
Or, perhaps, they truly were considered cuckold videos by the creator/uploader,
wherein the white cuckold has little inspiration to perform the kind of anxiety reserved
for white cuckolds encountering black men. Yet there were still examples of white-onwhite,
‘traditional’ cuckold porn which showcase, among other elements, the cuckold’s
psychological torment at the sight of his wife’s infidelity, his submission to the cuckolder,
and the ‘forced’ performance of queer acts. So, on one level, race clearly is not a necessary
condition for a video to be a cuckold porn text. The subgenre as a whole, however, is undeniably
obsessed with, if not predicated on, interracial sex. The cuckold and his wife/girlfriend
are almost always white, and the cuckolder is black two-thirds of the time. The
near irrelevance near irrelevance of black women (and women of colour, generally) to the fantasy is made well apparent.
So, it seem the claim is quite true based on this sample.