Here we can still "fit a square peg into a round hole" with great effort and grinding noise, that the humans of the southern lands have black or swarthy skin in fantasy world. And only because we know it from the real world.
I find it odd to reference the adaptations in humans based on geographical locations. While outright refusing its potential existance in other races.
Especially if you want to compare to real world, where many species of animals have differences based on geographical location. Both in terms of colour and other physical traits (For example, the Tazmanian Platypus is much larger than the Austrailian Platypus. They're the same species, but geographical differences change how they develop)
It would make sense to have "Black" fantasy races. Since the colouration is based on melanin content in the skin, an evolutionary development to protect skin from the deadly laser in the sky known as the sun. Animals don't always have this pigment because their skin is under their fur so its not in direct sunlight (Though some still do have it), but fantasy races are based on humanoids and thus lack fur and as such would also evolve to develop melanin pigmentation to protect their skin.
With the evolution of lighter skin colours being due to humans moving to northern regions where there was less sunlight meaning that protection was less important and absorbtion of light was more beneficial (Since, yes, white skin is the evolutionary divergence from early hominids) - Then of course the "Asian" traits are further adaptation to the particular climates of the region.
Well... It makes sense depending on how much impact evolution is supposed to have occurred since their creation (Of course, you can never discount the possibility that when the race was created, they were created with such differences included). But if you accept humans changing based on geographical location, then there would also be similar evolutionary adaptations in fantasy races too. Of course, keeping in mind the inhabited locations of each race, as fantasy settings having multiple sentient races it's not like the real world where humans populated everywhere, there would be territorial disputes from early on limiting the places where races reside in the world.
As such, I wouldn't necessarily call ethnic options for fantasy races "Tolerance content", but more so including a pretty basic tenet of life that is often overlooked in fantasy settings.
If humans in the setting have "Black" or "Asian" adaptations thanks to evolutionary pressure. Then the same would be true of all fantasy races unless explained otherwise (Such as the race living in a very small region where there are no geographical differences for any members of the race, or if a race had other practices to cover such environmental pressures to mitigate the need to evolve such traits - For example, covering oneself in mud to protect against the sun)
Of course, there's always the possibility to use "Fantasy BS" to make up alterations to the normal processes (I.e. Build up of melanin, causing a dark brown colouration) in order to make fantasy races have different presentations of ethnicity. Such as how Drow/Dark Elves have a blue/purple skin tone thanks to "Fantasy BS" reasons. (Or better yet, actually provide in universe explainations for things... Like how Warhammer's Orks and Goblins have green skin because of the presence of chlorophyl due to their origin being plant based)
