That's the right term for it, they may have interest for it and they have the most bitcoin that are holding but they don't have total control for bitcoin. But each of their movement is very solely important to the whole bitcoin system and does affects its price all the time. I speculate that big pools operator are living there and as well as some of whales.
We wouldn't really know who are the users of bitcoin in China but why you wouldn't believe such news if there are factual information that they are already into bitcoin and most of them are mining it already. Also many of them are holding bitcoins which is leading them to be one of the most powerful country that are contributing to the price control.
Yeah there are many bitcoins that already mined and use world wide.. and i think not all in china are buying bitcoins right now.. many people are buying in bitcoin not only china.. and many company right now are using bitcoin.. also bitcoin is decentralized so it is impossible that china can be control bitcoin. maybe they can dump all their mined bitcoin that can affect too much the value of bitcoin.. because they are holding a large number of bitcoin.