Is it still illegal to know things in China? I read stories all the time about government enforced censorship in China, so I think it's fair to assume that people in China know less about the country than interested parties outside the country, right?
And while I am just a white American dude, thankfully one who can find China on a map. The tone here screams needless hostility.
I think the idea that people living in a country understand their own lives worse than an outsider is beyond absurd. People can certainly understand whether they are happy with their lives and whether their quality of life is improving or not. Given that vast majority of people in China claim this is the case, I'm going to go with their lived experience over your notions about what life in China is like.
Frankly, the fact that people in US have been convinced that they know better what life in other countries is like than people living there do is a testament to the effectiveness of US propaganda.