

Yes, Chinese people deserve freedom to express their political view. And they can do such in the democratic centralism state. Research by Western institutes (in the US for example) shows that the 95% of the people are satisfied with the government
If you want to learn more about China and unlearn a few misconceptions and propaganda we’ve all been subjected to, this wiki sums up a lot a things: https://en.prolewiki.org/wiki/People’s_Republic_of_China
Why do you think China has a capitalist economy? Because it is thriving? It is indeed! But this is unrelated to capitalism. Capitalism is not economy good and international market access, socialism share potato and live happily.
Capitalism is the control of means of production by a few individuals and exploitation of the workers enabled by this private possession. In China, the small and medium companies are allowed to be private but the bigger companies or the ones in critical fields are nationalized. Something like 80% of investment firms are public as well
You can read more on this wiki: https://en.prolewiki.org/wiki/People's_Republic_of_China