Besides trying to blackwash Japanese history, its because of the powerful and positive reputation that samurais have that they want to shove blacks in to that history right? Samurais are known for being loyal , fearless, being honorable, choosing death before defeat and following the samurai code. ....
But did Yasuke display any of these traits? Even if you took the jesuits stories seriously, he didn't commit seppuku after Oda died which is what samurais do when their lord died, nor did he try to avenge Oda, , he was never trained to follow any code, as he was in Japan for only one year and was Oda's servant for only a few months, and he was simply returned as a slave to his jesuit handlers after Oda died and the battle that he fought he just immediately surrendered. They are trying to associate Yasuke with the positive reputation samurais have but he displayed no samurai traits.. He was really just a loser no matter what you call him
Firstly, they see it as uplifting regardless of whether or not this is historically accurate.
Secondly, they want to negrify history to make it more inclusive for the future they have in mind. Basically this isn't going to stop - they need their stochastic suppressive forces to feel welcome, so that they may steer "democracy" in the "right" direction. I guess Japan just wasn't complicit enough.
This is the first of many weaponized forms of this type of media that will likely hit their shores.