Unfortunately in 2020 it looks like even acknowladging the existance of things like slavery is somehow equated with approval of those things. There was a case where someone got upset(on twitter, of course) that there is a character in Valhalla who is described as "disfigured" - apparently that's ableism. So Ubisoft apologized, don't know if that description got changed or not in the end, but even if such small things end up getting the company to apologize, how could you even contemplate adding a topic like slavery in?