So what is white skin is their norm. It’s not about Japanese people. It is about middle eastern people. If they don’t want to have middle eastern looking people, then just make another Japanese fantasy story.
It is a story based on middle eastern mythology, not it's people. It's trying to tell a story, it isn't as if they are trying to completely represent its people. Just because I used chinese mythology in my story, and it only has caucasian people doesn't mean I am being racist.
It actually is. That's called white washing. If they don't have Middle Eastern people in a Middle Eastern mythos, then they are Japanese Washing. You cannot separate a mythology from it's people. It would be racist if I was to have a Japan based story but everyone in Japan is Black.