If I am not mistaken, a good portion of these newly constructed coal plants are meant to replace existing ones that are obsolete and inefficient. It would be hard to judge its impact on net pollution without relevant data on plants retired.
"Most of the news coverage of Google’s move against Pinduoduo emphasizes that the malware was found in versions of the Pinduoduo app available outside of Google’s app store..."
Given this, it could also be the work of some shady third parties.