If you're not familiar, these sorts of mods are near universally made for racist dogwhistling; they're the "barely passable but not really" version of mods that would straight up whitewash non-white characters. The entire debacle started a couple of years ago iirc with the game Stardew Valley, which has non-randomized unique characters and someone made a mod to iirc whitewash the black characters that the game has (straight up just respriting them to look white).
The mod was pulled from both Steam and Nexus if I recall, and a few weeks later you saw these sorts of "one skin color only" mods appear in games with a heavy focus on randomized character creation (the uploaders of these mods also usually try to say it's not racist by uploading multiple variations such as a mod that disables all white skin colors; this is just flimsy excuses, which becomes apparent when you look at the activity stats for these mods). Modding sites aren't very reliable on taking action on them, so it's the loophole used to still get away with doing racist shit.