I wouldn't say it's disingenuous... given that there's nothing legally preventing mainland-Chinese from choosing to live in HK, and then being quoted as people who want "their" city back.
Odd to think, but HK is now experiencing a real Red Scare, the likes of which the US only ever imagined in the depths of paranoid delusion. There are real (CCP) Communists, living amongst the HK citizenry, nudging HK's democracy (such as it is) toward their agenda by appearing to stand for "public sentiment"!
It is important to understand there is some truth in the statement, while it neglects the symbolism that Hong Kong citizens have rallied behind.
It is no longer important, but the possibility of extradition to mainland China was a very small part of the bill, which updated a long list of countries that extradition would be possible to. It also lowered the number of crimes that were extraditable.
So on its face it was a meaningful updating of an old law and mostly kept the existing process which was full of appeals and approvals of various departments to actually extradite someone, but the mere inclusion of one particular country allowed everyone to channel their disdain for crossing an ideological line.
So when the first protest happened, China's cherry picking of the issue is not at all inaccurate. Coupled with the understanding that all the disdain comes towards them, from their own autonomous region, it is pretty embarrassing.
Back in 2012 I went to a few Occupy Wall Street protests and encampments, I was very surprised to see how many advocates for "real" communism - since nobody has done it correctly - really were hiding in the bushes the whole time.
(I did read up on this seemingly comical notion, and I can at least tell you that they're correct, communist countries have never gotten to level 2 which calls for abolition of the state, and all fail during the pitstop of centralized power.)
This is completely wrong.
Mainland-Chinese may only move to Hong Kong to reunite with family, and they have to apply for a One-Way Permit, which has a "quota of 150 people per day and the waiting time for spouses is currently 4 years": https://en.wikipedia.org/wiki/People%27s_Republic_of_China_P...
To even visit Hong Kong requires applying for an Entry-Exit Permit in person, and duration is typically limited to 7 days: https://en.wikipedia.org/wiki/Exit-Entry_Permit_for_Travelli...
https://www.scmp.com/news/china/policies-politics/article/21...