'One country two systems' as agreed to by the CCP under the Sino-British Joint Declaration, prior to the handover of Hong Kong, means that the PRC is only responsible for military defence of HK.
Anyone who disagrees that 'one country two systems' applies in Hong Kong is accusing the CCP of lying. Which we know the CCP would never do.
Edit: anyone who has spent time on HN in the last few years and commented on the actions of the CCP should be familiar with the usual brigading by pro-CCP people - anyone with half a sense of decency would welcome the downmods. But to those who downmod, you just accused the CCP of lying. Enjoy being disciplined by your masters.