I like how you gloss over the 99 years of seperate development as "Not China" in between.
Well he did mention the drugdealers. The return of HK is of course seen as a necessary righting of something that never should have happened in the first place, in the eyes of many Chinese. Judging the legality of various laws and treaties imposed due to colonial wars of past centuries is another can of worms I won't bother opening.
Not sure if you're being deliberately obtuse, or you really don't get it. Hong Kong might as well be another Singapore. Do you really don't understand why Hong Kong don't want to be Chinese? And don't feel that they are Chinese? Do you feel like it's some form of betrayal?
Well then they are free to GTFO with whatever they want to carry, so long as they recognize the land itself is Chinese
If they want to be independent or have more autonomy, then they should wait for the long game because they sure as hell aren't getting it in the near term.