I may be misremembering but I’m pretty sure the same character appears in Nioh or Nioh 2. A Japanese game made by Japanese developers. A cameo, but a representation of an historic figure and not some random person plucked out of historical obscurity.

I probably won’t play the game because I’ve never really been a fan of the Assasin’s Creed style but imagine getting your knickers in a twist over something that no one is forcing you to play. There are a bajillion other games. So weird.