I see how it could be bad, simple supply and demand should have great impact in a wide market such as rent, and hiding the supply deficit behind a forced price sounds like treating a symptom and not a cause.
But when they say that only 4% of the expansion projects was cancelled, which could be for any number of reasons, I get some doubts regarding how damaging it is for the market. It could be one of those diseases where the symptoms alone create so much trouble that hiding them is already a massive benefit, preventing numerous other issues from sprouting.
I think the whole issue needs to be addressed from multiple angles, no one solution will be enough.