"Higher prices for everyone" is not the argument, though. The article is about supporting the construction of market-rate housing as a relief in the market. More and more, the evidence for this argument has been proven valid.
You complain about saving for a nice house, but the idea of waiting for some government agency to give me a unit, only to potentially outgrow it or need to move for work, and then deal with it all over again, seems absolutely disastrous to me. I want agency in my living situation, not whatever the government deems appropriate for me.