All governments are authoritarian, as in they exert authority. What matters is which class is being represented, which class is exerting its authority. China is democratic. It doesn't have a western liberal democracy, but it does have a comprehensive Socialist democracy. You can read this article talking about why the Chinese democratic model is in place and why the people support it, or this article on how the Chinese model of democracy works in contrast to western democracy, or this short video on how it works, or this video on how elections work, or this article on the makeup of the NPC.

By what metrics is China not democratic? What mechanically would they have to change for you to accept the opinions of the Chinese citizenry on their own system? I recommend this introduction to SWCC, it goes in-detail about how elections and the democratic model work in China. what mechanically would China have to change in order for you to accept the system that the Chinese have implemented by and for themselves, and approve of at rates exceeding 90%?