> I wish there was a solid single source of truth to figure out what's really going on in China

What kind of sources are you looking for? The Five Year Plans are the best source of truth for what they are planning on doing nationwide. The annual Statistical Communiqué on National Economic and Social Development and China Statistical Yearbook from the NBS contain statistics on how that implementation is going. Then every year the NDRC delivers the Report on the Implementation of the Plan for National Economic and Social Development and on the Draft Plan to the National People’s Congress which packages up the statistics on how the plan is progressing.