Never even thought of it as "coded fear of anglo parents" or some hidden fear white people have of the "pro-social high IQ of Chinese nation" as you put it.That's a typical viewpoint of what the modern term is called "shitlib". The hardworking Chinese child is penalised for succeeding on merit because it affects the rainbow palette of the student body. What you just expressed is the coded fear of the white anglo parent who cannot compete against the millennia old pro-social high IQ of the Chinese nation. The days of the Anglo universities as centres of scientific research coming to an end cannot come soon enough.
America is a multiracial society. Harvard doesn't want its student body to be overwhelmingly dominated by one group. If you only want merit, then Gaokao is for you.