It is, in my experience, true. I live in an up and coming suburb of Detroit and every new apartment / condo building is incredibly skewed towards the high end.

In fact, a huge development project is going on in the downtown area currently. One of the requirements of the project was to set aside a certain percentage of the new units as affordable housing. When the developer was asked about the affordable housing at a city council meeting, they revealed they were targeting a price point of ~$1600/mo for a 1 bedroom. For context, the going rate in the city for a bedroom is $300-800/mo. There was no language specifying what exactly affordable housing so they can get away with it (something the city is working on for next time).

My point is, this is a real problem. You need to think about it and you need to actively prevent it in from happening in whatever legislation you put forward.