Knowing about China is a communist country then it isnt really that surprising that they do really want for everything to be centralized and would really be controlled by them.
I agree with you, it is not surprising because China is an authoritarian country. China government probably wants Bitcoin to be controlled as a centralized system as well. But it cannot happen, Bitcoin community won't let China government controls it. In addition, I am wondering how China can control Bitcoin as it is purely something valued based on the demands on the market. The demands can be decreased massively when Bitcoin can be controlled by a country. People are interested in Bitcoin because it is decentralized, those people may go if it is not decentralized anymore.