Building coal plants doesn't impact emissions (materially, anyway). It's the using them to burn coal part that causes emissions (and generates electricity).
Yes, many of which are expected to never actually be used. Accidental result of how China does its provence based infra funding.
Right now China is building out more solar and wind per year than than the entire total deployed solar and wind in the entire UK, and they’re only getting fast. Their ability build renewables now vastly outstrips their historical coal buildout and their rising energy demands. They’re well on their way to achieving net zero far faster than anyone thought was possible.