Communism is a utopian ideology from the 19th century. That doesn't mean communists don't exist, and the people who advocate that ideology aren't communists. Of course China isn't a communist society. Nowhere is or ever will be.
It's a bit like saying Tom Cruise isn't a real scientologist because Xenu doesn't exist.
It's a bit like saying Tom Cruise isn't a real scientologist because Xenu doesn't exist.