What the author fails to emphasise more - and really should given the title of the article - is the part played by availability of credit. This was the nail in the coffin. It's possible to come away from this article with the impression that oversupply caused the crash, rather than the more correct take that it was a collapse in investment demand due to availability of credit (in my opinion).
Just overlay any graph of interest rates together with house prices for pretty much any market with an accommodation crisis and the correlation becomes pretty obvious. Interest rates go up and booms stop. Sometimes they crash spectacularly.