I'm going to assume the Chinese graffiti was written by someone in-universe who didn't know Chinese (or at least Chinese writing) very well. Like when someone

I'm going to assume the Chinese graffiti was written by someone in-universe who didn't know Chinese (or at least Chinese writing) very well. Like when someone in our world gets a tattoo of gibberish because they think it looks cool, maybe someone in the world of Blade Runner wanted to graffiti some cool Chinese characters they looked up in a dictionary.