https://spice.fsi.stanford.edu/docs/koreans_in_japan https://spice.fsi.stanford.edu/docs/koreans_in_japan They don't speak to the particular law, but they are

https://spice.fsi.stanford.edu/docs/koreans_in_japan https://spice.fsi.stanford.edu/docs/koreans_in_japan They don't speak to the particular law, but they are speaking of the patrilinear transmission of Japanese-ness. I'll keep digging - my source was a Zainichi family in Japan in 2004.