This really doesn't make any sense as an explanation for housing becoming less affordable or as investor behavior in the housing market.
It's really kind of a simple issue at heart. In some places, growth in jobs (and especially high-paying jobs) has exceeded growth in housing supply. That causes relative prices to go up. Markets generally handle that situation well--if demand for something is higher, it becomes more expensive if there isn't an increase in supply, which in turn causes more people to produce that thing and for prices to come back down. That's why market-based economies do so well. In this case, there are legal restrictions on supply growth that prevent that process from working.
Imagine if in 2008, gov'ts passed laws restricting smart-phone production. Prices would go way up, as more people would want them. If it were impossible to make enough to meet demand, companies would focus on the top of the market, and you'd have idiots saying that allowing more phones to be made just makes them more expensive. You'd probably have some hoarding, and more idiots saying that hoarding is the reason for the high prices.