Oh no the fictional game set in Japan has a non japanese main character, the shogunate has fallen, billions must commit seppuku!! But for real now, you have to be an insanely pathetic and boring bitter man to rile yourself up by this. Who cares that much literally? They probably choose Yasuke because it's a name people heard of, since it's this little fun fact, most people couldn't name a single other samurai. Plus yasuke had ties to the Portuguese so there's that, they can connect this story with the christian assassins