Well if we're going to agree to live in a world where words don't have meanings anymore, then sure, China's a "democracy".
If however we want to have an adult conversation about it, then we need to agree on the meaning of words, and "democracy" is literally "rule by the people". Given this (admittedly broad and forgiving) definition, China with its autocratic , centralised rule by a one-party government for which the public has no peaceful means of deposing is objectively not a democracy.
This isn't to say that the US is much better of course, but you don't do yourself any favours by measuring yourself against the dumbest kid in the class.
They're both terrible, though at least the US has free(ish) and fair(ish) elections.
Ah, I must have read the Wikipedia page wrong. I thought it said "slim minority". Well it's good to hear the Greens aren't in bed with this!