I think that is a stretch beyond snapping point for Hong Kong. Most days in Hong Kong I could see the air pollution obscuring buildings in the distance. It's AQI is terrible https://aqicn.org/city/hongkong/ . There are nice mountain walks and nearby islands but it is extremely dense and urban. It's one of the places Ghost in the Shell used for reference!
Also the narrative here feels mostly from the mainland China point of view; having to go and deal with "problematic" Hong Kong. But problems between Hong Kong and the mainland began when Beijing used its influence to restrict Hong Kong's traditional democracy, so only "approved" candidates could be voted into office. And since then it's increasingly clamped down on the freedoms Hong Kong previously enjoyed, most recently doing things such as removing the Tiananmen Square memorials (https://www.bbc.co.uk/news/world-asia-china-59764029). At this point the writing is on the wall and bit by bit Hong Kong will brought in step with the rest of mainland China.
Unlike the author I found the Hong Kong bureaucracy fast and effective. Enforcers "sometimes able to look the other way" sounds like corruption to me and people with better guanxi being able to bend the rules. I'd rather have the laws fair, clear and applied to all equally (though that's always going to be a gradient).
Despite all that, it's undeniable China is on the rise and that's going to be the dominant story of this century. There's potential for that to be a great boon to the world and I hope that's the reality that comes to be.