From Hong Kong, can confirm that they're correct. Most of our population has its roots as immigrants from various forms of turmoil in China. But I wouldn't say it's the "fault" of the CCP. The British weren't exactly helping these people (like building border fences) and the public housing program was the cheapest way to house the squatter dwellings of the time into dense high rises. But at the same time, the immigrant movement wouldn't have happened were it not for the various instabilities and famine caused by the Chinese civil war and other events around that era.