At least from the people I know, there are a lot that argue that because China does have local elections which filter upwards in their one-party system, there is an element of representative democracy that isn't that different from America.

In China, the candidates are heavily filtered and selected by the ruling party. The same can be said for the Democrats or Republicans selecting their own candidates to put up in primaries, heavily biasing the vote through gerrymandering and voter suppression, or the election system itself selecting for certain types of people -- namely people with enough inherent wealth or influence to run.

So, is the sarcasm obvious? Maybe if all you read is fairly unsophisticated and biased media. But, when you look at the nuance, is it obviously sarcastic to say Xi was elected fairly and freely? It's about as obviously sarcastic as saying Trump was elected fairly and freely.