I was just surprised why did people find the mod that much offensive. I wasn't aware that the authors intent wasn't to just change one character into different gender, but to effectively purge all diversity from the game, including the racial one.

That changes my point of view, because then it makes absolute sense why you wouldn't allow someone like that on your platform. That was the context I was missing. But if I took the mod at face value, without the rest of the anti-diversity modpack this mod was made for, I still don't see an issue with wanting to change one characters gender for your own playthough, or a reason why to remove such mod from your platform, especially compared to all other "change this character to female" mods that Nexusmods is full of. But given the context, Nexusmods are in the right here, of not wanting to support someone with so blatant propaganda.