I think this is getting downvoted because it sounds racist but Afro Samurai is a real and fairly popular anime / manga which is indeed inspired by Yasuke. This is cool.
I don't want to go too far down into the weeds on meta community stuff (it's endless man ...) but generally on HM 'super cool' and such comments are downvated, the idea being there isn't a lot of content there.
It's not 100% consistent, but I'm guessing that has more to do with it than any perceived racism. Anyone who read the article already saw that term used.... it's also not something most folks think of as racist IMO.
It's an old term and as such is considered to be used by people who don't care enough to adopt more modern language to refer to people of the race and their culture.
In this case, it's the title of a real show and the protagonist is very respectfully portrayed in the anime. Recommended.
Hey dang, stcb, you wonder why we have no respect for you? This shit which you refuse to rectify or even acknowledge is why. Your incompetence shows as brightly as the downvoters ignorance.