I literally gave two examples in the the post you quoted. As to your second point, 'democracy' can and is claimed by some of the most authoritative governments out there.Are you able to give an example an authoritative democracy? Democracy is the very antithesis of authoritative.
How long since China has a communist society? Going by the dictionary they still are socialists.
Do you know the difference between capitalism vs socialism vs communism? Angry Twitter users might not, but you can learn the difference.www.dictionary.com
Communism, on the other hand, is a branch of socialism. It’s similar in that it’s still founded on the idea of collective cooperation, but differs in that communists believe that cooperation should be run by a totalitarian government made up of one and only one government.
As to China being communist? They have the second highest count of billionaires in the world.