I think Chinese people will be happier to hear you call people from Hong Kong " Chinese".Hong Kong is a part of China, there's nothing wrong calling someone from Hong Kong "Chinese". Instead, when you call them Hong Konger, it may sounds like that Hong Kong doesn't belong to China.It depends on in what sentence you use it.When you talk to a Chinese person, I think you'd better use the word "Chinese" since some of us feels unhappy with the word "Hong Konger".

After 1997, Hong Kong became one part of China. so there are something wrong when subtitle are separated hong konger and chinese. you don't dig deeper they are same or not, because hong konger think themselves are hong konger not chinese. so Chinese subtitle is made by two kinds of people. Chinese subtitle is 中国人。means hong konger belongs to China. so I think it is normal all the time. but hong konger is chinese. that is the reason why they are different.

First, it is not a good translation from that video, because it should have been precise and unbiased. Besides, you can call a person from Hong Kong Hongkonger/Xianggang.ren (accurate, informal), Cantonese/Guangdong.ren (most popular used overseas) or Chinese/Zhongguo.ren (too general) depending on their preference and your idea about them. There are other reasons why this translation happened, but they are not from the perspective of language so I would not explain them here.

The New York analogy was a fallacy. Yes, New York is a city of USA and Hong Kong is constitutionally part of People's Republic of China, but these cases are not comparable at all. The Empire of China (which is NOT People's Republic of China back to 1842) lost Hong Kong when the UK won the Opium War in 1842. The People's Republic of China (PRC) wasn't founded until 1949. Also, it's simply too misleading to say "One Country, Two Systems" was brought forward by the then Chinese leader Deng Xiaoping to take back Hong Kong. It was merely a tactic to convince Taiwan to become part of the PRC. Plus, officially, mainland Chinese students are considered as non-locals/international students when it comes to every university's policies. It would be ethnocentric to assume every Chinese to speak Mandarin if you travel a city which Chinese and English are the official languages. Ms. He, please stick to the facts.

hongkong is totally lost control from beijing central goverment , indepentce they want no chinese , just hongkonger