Ok 1st off a Trump vote may not indicate racism, but it is quite the insight as to the amount of racism you'll tolerate as long as your pockets are ok.
2nd the list seems to imply its only referring to gay porn stars, but porn stars in general unfortunately tend to be slaves to their fanbase, and for that reason a lot will not perform interracial scenes with black people specifically, seeing as they stand to lose a large portion of the white male fanbase not keen on seeing "their" star doing such a thing(there seems to be a softer attitude towards latinx and various asian ethnicities provided a fetish hierarchy is preserved)
So as such I take any list like this with a grain of salt, because unfortunately sex work is one of the few places discrimination is not only allowed but encouraged, and a lot of the stars arent really in a position to simply perform with whom they want or they feel comfortable with...I imagine thats why James Deen was able to stick around for as long as he did. Even with the accusations about him known in the business, his popularity still generated work, and I imagine more than one actress basically had to just deal with him if she wanted to maintain her popularity.