tl;dr version
The person is right that Jews were present in vast numbers within Bohemia. We wanted to portray that but eventually ran into several walls. Primarily budget, because a properly developed Jewish community would require a lot of unique assets. Secondarily, we learned that that Jews resided predominantly in towns and cities with certain properties and none of the KCD settlements fit the criteria.
Side note: Several members of the team are/were Jewish or affiliated to the Jewish community. Think of Vávra anything you like but he certainly is not an antisemite.
Side side note: I was hired after I wrote a concept for a quest which was centered around Jews and their struggles in medieval times.
The person is right that Romanis/Gypsies probably already roamed the lands for several decades in 1403. We had it researched and were primarily concerned whether they were still largely a mystery to the locals or a common sight. Well, 1403 seems like the time where Romanis were still in the phase of gaining notoriety. This presented an interesting challenge because we only know how the relationship between the Romani and the local populace looked like much later. Anyway, we did entertain the idea of having them in the game. Some quests were proposed and developed into a draft version but we ran into the same budgetary constraints. Nor did they fit within the core story. We would implement them only for the sake of inclusion which nobody would be against since, you know, they were historically present in significant enough numbers. But again, budget. Jews had much higher priority and they had to be dropped, so...
Side note: I remember Romani being integrated into the story of Assassin's Creed Revelations (the Istanbul one). It sucked ass. It read like trivia from first two paragraphs of Wikipedia article about the ethnic group. A Gypsy lady is leading you somewhere telling you "We are Romani. They call us gypsy because they think we came from Egypt. LOL." You're an Italian in Turkish Instanbul (by that time for sure still heavily Greek) in early 1500s. The term Gypsy is purely English language problem. I'm not sure Gypsies already reached England by that time. And then you get their logo on the map. And that's the end. I'd rather have no representation than this half-assed hack-job.
The person is right that these groups should have been in the game, particularly Jews, and that game would have benefited from their presence.
The person is an utter idiot for claiming that this makes the game in any way fascist. If anything it's a bit whitewashed, in placed by mistake, in other places by necessity. No game has ever managed to portray reality in its entirety and we would not be able to do so even if we had GTA5-level budget and manpower.
It could be argued that some fascist or any other hateful group could use the game to support their idiotic and hateful narrative. But I have yet to see that happen.
The game has more flaws, representation-wise. There are no kids, no disabled, no seniors. No Italians,
no Poles, no Turks, no French. No crossbows, no flails, no firearms. Dozens of crucial animals are missing. Many crucial common crafts and occupations are not portrayed, and a lot of those that made it into the game are extremely over-simplified or stink of ahistoricity (like the way bakers worked in KCD). The Czech-German tensions are underdeveloped, the complete absence of any humanization of Cumans is a sorry oversight and missed opportunity. Many of the key characters lack any spouse which is hilarious when you think about it in terms of medieval society for more than a second. Some aspects are outright wtf bordering with fantasy tropes (fairytale-ish herbalists). Dozens upon dozens of common period-characteristic phenomena are not portrayed in the game. Some are only hinted at. And so on. There is a lot to criticize when one wants to scrutinize the "as accurate as possible" claim. Yeah, "as possible" leaves a lot of wiggle room but it should never be an excuse for lackluster delivery on that promise. Still, you can always only approximate reality, for it is too large to grasp, let alone replicate.
