I can't help but think that the AC games, and other games of historical fiction, have not/ever been entirely accurate, particularly mass-market/successful ones. As I understand it, Ghost of Tsushima's representation of Japan is not entirely accurate to the time, borrowing different accoutrements from different periods in the country's history, and doing the same for the Mongols.
I can't help but remember that not everything in Odyssey or Origins, or certainly fucking Valhalla was actually rooted in real history or reality at all.
So I can only assume thay the real problem is Yasuke and his being African. People just have/pretend to have a stick in their ass about all the other stuff that they don't actually know or care about. Remind me when the entire internet was a concerned expert of Japanese textiles in the Sengoku period?
The convenient application of identity politics, of course. Thing is that plenty of people on the other side of the GOT debate said, quite rightly, that the ethnicity of the devs does not and should not qualify or disqualify them from the right to make executive decisions on how to craft their game. And that you can only judge the game as it is and how it's intended to be.
Now that side has flipped the argument. "Look at how many Japanese people are complaining about the game!" And obviously, the other side has done the same.
The thing is that other Japanese made games have depicted Yasuke as a samurai, with all the same/similar errors/liberties by exhaustive historical standards. And I'm sorry, but AC is a historical fiction/scifi franchise. A few museum highlight functions don't suddenly change that fact.