The issue may not be that there is too much building, but that they're building in places people aren't going to be moving to. Ordos is in inner mongolia, and while there are a lot of people there, a lot more are moving to the east coast cities.

Right, like if you were predicting 40% city growth in the US, the solution would not be to build new mega cities in Utah (which has a comparable percentage of US's population as Inner Mongolia has in China).