What about positing, not that they are subhuman, but evil? Scholars have been positing that Christians and whites are evil for several decades now. Not at campus protests, but as official classroom lectures.
Might be synonymous with untermenschen, just another way of saying it. That was used against Jews in the Middle Ages. Blood of infants in matzah, poisoning well waters, etc. Also used by the Nazis along with inferiority; they are also trying to take over the world, and stabbed Germany in the back, etc. I’d say it’s the same.