I think this goes beyond that. This is partly a reaction to.... This was not the first attempt last year. It was not the first attempt for them to implement an extradition or security law. This has happened before.
What is different and what goes even further, another feature that's very scary in the national security law, is that there is now a Chinese security office on the ground operating in Hong Kong directly, outside of the jurisdiction of the Hong Kong government. I think what you're seeing is that this is one step further than just national security or extradition. This is now de facto Chinese enforcing and charging and investigating “crimes” directly with Chinese security forces, rather than having any involvement in the Hong Kong government.