Alright. So for background, Kingdom Come: Deliverance is set in Bohemia (Czech area) in 1403 during a Hungarian/Cuman (Turkish) invasion. From what I understand, the writer/lead dev/whoever was asked about racial representation, and has basically emphatically said "there were no people of color in medieval Bohemia". He apparently has ties to GamerGate and some allege he has worn neo-nazi band shirts, but I have not confirmed either of these. He also mockingly posted a photoshop of the lead in KC:D replaced by a black American. In any case, it seems to be the case that he has strong perspectives on racial representation in medieval Europe which aren't about accurate history.
However, some of the response also strikes me as wrong. Unfortunately for us, medieval kingdoms didn't collect data on their country by modern racial lines. So, we definitely know black people would have been around Europe in the middle ages. Many people would have seen them or experienced them in their lives. But it's difficult to say what proportion people around in the Czech area would be categorized as black today. If I followed my gut, I'd really have to say, probably not too many. For people in rural areas it would probably be an event to see a black person come around. In any case, it's categorically false to say black people didn't exist in medieval Europe. Some people think that saying so is an excuse to cast only white people.
You can also go too far into the reverse direction. What you have today though is people like the Tumblr blog "MedievalPOC", who give very bad arguments and support conspiracy theories about who was colored in history. Of course, you also have the "Egyptians were all black", "Mozart was black", "Egyptians were so advanced they traded with native Americans" and etc. historical revisionism about race. I find these people are going the opposite direction in that they try to make it sound like 1 in every 5 people in medieval Europe were black skinned.
Basically, people who
think it's fine to misrepresent history so long as it benefits some marginalized group.
So if you take for granted that someone wants to just make a game as historically accurate as possible, how would you handle race? Well, if you're choosing, better to not err on the side of the Nazis. It's a shame the lead dev had to be an alt-right kind of guy, because he could have argued racial representation much better from a neutral standpoint.
Moral of the story, when you combine history with modern political agendas, you get stupid ****.
From what I've read, I find far worse the treatment of women and cumans (Turks) by the game. No female characters are given much agency, apparently, and Turks are basically portrayed as evil invader rapists. The devs try to excuse the treatment of women by saying society was patriarchal, but even in that context it's not like women were all passive and submissive to the system, so yeah.