Sure, but it's important to distinguish when a word is being used two different ways, and the only way to do that is define them.
There are people who use Lenin's definition of "socialism" as the name for the transitioning stage between capitalism and the communist goal in the Manifesto.
There are also people who use "socialism" to mean any time the government does any regulation or helpful policy of any kind.
Marxist-Leninists do not argue that when you have a communist revolution that you'll just magically end up with communism. Look into the "dictatorship of the proletariat."
No, of course not. China has a strategy of democratic centralism, which actually seems to be a quite effective implementation of a democracy. Unlike in countries like the US, Chinese citizens are quite satisfied with their government.