Yes, thanks for the clarification. I was trying to make my comment specifically about secession - debunking the notion that Hong Kong is not part of China. The HK Basic Law, the same document that guarantees the "One country, two systems" approach, starts with the sentence "The Hong Kong Special Administrative Region is an inalienable part of the People's Republic of China."

I agree that the mainland government acted rashly. The forced implementation of the national security law definitely violates the spirit, if not the law here, and understandably a lot of people were alienated by this move. That said, the Basic Law does provide a provision for the implementation of such a law (Article 23), and there's ample wiggle room for the governments involved to argue that they haven't yet demolished the "one country, two systems" approach as yet.