Looks like I misremembered the quote, but he literally said, “There were no black people in medieval Bohemia. Period.” So not all of Europe, but at best, that is not something that can be said that definitively, and more likely is just plain wrong. There were people from Africa and the the middle east in Europe at the time and even church officials from Ethiopia.
In a game that is supposed to be about historical accuracy, it just kinda fails and even leans into nationalism over accuracy. That mixed with sexism (in game and real life from Vávra) and homophobia (which seems to be only in game) means a no go from me.