This is not a judgement against China, but a nation that plans massive infrastructure projects, has a history of single-party rule (and rule by dynastic monarchs) and also is responsible for the Uighur re-education camps, doesn't really sound like a country unwilling to wield it's military might.
While it's citizenry and residents are much more diverse and identify not as Chinese but seperate, HK has historically been part of China, and only really a separate state/entity for a couple of centuries.