If nobody is allowed to express support for Hong Kong on Chinese social media do we really know what their sentiments are?

I would love to truly know the sentiments, statistically, of what the Chinese citizens perspective on HK was. I've asked a few people but they dont want to talk about it or dont seem to really care. A lot of Chinese I know are nationalistic but dont care about the day to day to news. Plus I imagine the bulk of people would only know whatever news they were plugged into. It somewhat analogous to Americans who I talk to and wonder how they came to the conclusions they did and then it all makes sense when they tell me they are only plugged into one network or media outlet. And both parties dont want to look deeper at all and have no desire to. It's a shame.