When people can be extradited to the unfair, Chinese domestic courts or failing that kidnapped by the Chinese government I would say that’s not ”largely autonomous” anymore. There’s no way for the kidnapped Causeway books employees to use the HK courts to get them out of Chinese courts, even though they committed their ”crime” in HK.
The respect of ”one country, two systems” was something China promised the UK. The international community is absolutely remaining in the picture.