洗人口 is a very interesting concept. I would classify it under the dirty trick of 反客为主 though it’s not as insidious as the whole process takes place in clear sight. It’s just that people who are “too busy minding their own business” ignore it. Young HK activist 羅子維 now living in exile in Taiwan tells us how the quota for mainland students in HK universities keep going up, squeezing local bona fide HK students out. Sounds familiar?
With 洗人口, the invaders don’t even need to use weapons or coercion. Over time, the local population gets diluted to such an extent that even if it’s a democracy, the invaders will eventually outvote the locals and turn it into their country. A new dirty trick from modern China.