It is trying to avoid hiring an ethnicity by saying things that a specific ethnicity would find offensive, but not others so you can filter them out of the hiring process.
That is not what that's about. It is trying to avoid hiring people who work for a foreign government by asking them to say things that would be illegal in their country. It has nothing to do with ethnicity and everything to do with nationality.
Nobody is trying to avoid hiring an ethnicity. There are plenty of Koreans that would still be hired, those from South Korea and everywhere other than North Korea.
I dont think KJU is held in high esteem by the defector community.