Bob asked me to comment on this thread, because he enjoys revealing when I know absolutely nothing about the matter at hand :-)
My experience in China was that specifying Bing as your search preference in your browser worked MUCH better than Google, simply because Bing will accept an HTTP (un-secured) connection, whereas with Google, every Google office except Google Hong Kong requires
HTTPS (secured and encrypted).
The Chinese Government will not allow connections to things they cannot monitor, except in International Hotels. So when I am in China I set my browser search provider to Bing, and add a link to Google Hong Kong to the browser.
I suspect that your issue is being produced by various pieces of software auto-detecting your location. Location detection is so common now that it is very difficult to find all the things that are doing it and turn it off. Start with System Preferences:
Start with Language and Region, and with Siri: set these all to English and Hong Kong, and then disable location auto-detection everywhere you find it.
And engage with Tisky Zhang: chances are she grew up in China: if she didn't, several people on her team did :-)
Bob: I hate you! :-)
Cheers