Parametrek
(Parametrek)
4
Scott Manley did a good explanation and debunking: Is China's Artificial Moon Plan Possible? - YouTube
Tldw: It would only light a small area for a few minutes on a few nights each month. It isn’t possible to use it as a weapon against ground targets. He also looks at how impractical a “useful” system in geo orbit would be.
Summary of tldw: Annoying publicity stunt.