There are no real estate developers in China. At least, not the kind you're thinking of. The government itself, the PRC designs and builds the cities. They are the alpha and omega in China.
No need to downmod me (I was sitting at +1 until literally the moment you decided to comment), what I said was 1,000% factually correct. There ARE ghost cities in China, A LOT of them. Just because some of them are no longer completely vacant doesn't mean they stop existing. The majority of those cities are still vacant. End of story, really.
Actually, it isn't. Over the last 2-3 years, China has been soliciting reporters and writers to come out and visit some of their "ghost towns", specifically, the few they've actually put some people in. They pay for the entire trip and basically give them the emperor treatment while there. The hope is that these writers will come back and write fluff pieces like this, they want to change public perception. I know they do this first-hand because my ex-roommate is a writer for a large well-known website and received such an offer. He had to turn it down because his wife was 8 months pregnant otherwise he would have went.
Oh, and your article talks about reasons for delays in getting people in there. I think the entire article is a load of BS (it's forbes, after all). Many of those ghost cities are beginning to fall into disrepair due to how long they've remained empty. At that point, justifications and excuses become a moot point.