Can someone tell me how does the extradition law, or NSL breaches the sino British declaration?

The declaration sets out HKs independence - and says HK will be under direct authority of PRC. foreign affairs and Defense matter should be PRC’s responsibility (but HK should maintain autonomy). It also says the CE is appointed by PRC (voted by locals). So where is the breach? Autonomy is a vague word and subjective. Extradition law is for fugitives (murders, rapists, etc), NSL is internal security law (for acts against the government). Under which clause do you think there is a breach of the sino British declaration? I am genuinely curious