As stated, the new section is not 'An exhaustive list of potential police states'. If that was the case, the section could easily provide a link to a list of every country on the planet! 

 The aim is to give a few examples in order to provide the reader with an idea of the characteristics associated with police states. This helps in the clarification (for the reader) of what a true police state actually is. 

 If, indeed, you know of (and have reputable sources!) for a valid characteristic of a police state which China exhibits that the others listed do not, please feel free to add it as this would truly contribute to the article. 

 Please clarify if I have misconstrued your point, but I understand it that your claim does not directly relate to the neutrality of the article - as such would you agree if the neutrality banner was to be removed?