They aren't even close to pure communism. It's a hybrid if anything.
First off, there's no such thing as "pure communism" and no state in the history of the world has ever been anything close to "pure communism" even if you mean to suggest some ideal Marxist society.
But to argue that China isn't a communist country is silly. It's an oppressive state with a strictly enforced single party system, run by the Chinese Communist Party. Only outside of China could someone say China isn't a communist country. They have a controlled market economy with allowances for private enterprise; which is not in anyway antithetical to the transitional socialistic period in an idealized communist society.
So, again, politically speaking, China is an anti-democratic, "meritocracy," which is structured as a communist nation. Economically, you could argue that since the late 1980s era of decentralization they've had a mixed-economy (so did the USSR in the 1980s during Perestroika), but again, having a mixed-economy that is nonetheless a socialist economy is not contrary to communism.
Lastly, the rights and benefits of Chinese participation in that economy are not necessarily universal or easily accessible; nor is migration within the country, or travel abroad.
It is not a free society whatsoever, and that lack of freedom is primarily due to the adherence of political communist doctrine.