it is kind of like trying to get authentic sushi: most sushi places and sp.s will say they are Japanese if you ask, but if you try to talk to them in japanese they will not be able to fool anyone. Many sp.s claim to be japanese and use japanese stage names, but are from other areas of asia. The trick may be in the end to believe that they are in fact Japanese and "be happy" .
BTW many "japanese" cars are not built in japan anymore either