Charitably, that's a very flawed blog post. Studies of housing affordability in Finland should not be used to make points about America. Finland has a number of legal protections that shield its citizens from the rampant price-fixing, collusion, investor-oriented building, and other predations of the American market.

That's not to say housing construction regulation isn't a problem. It is, but two things can be problems at the same time.

Without reading your link: this is a problem across new and existing builds, so it can't be an issue wih permitting. Housing cost growth has outpaced wage growth for decades. We are reaching an inflection point of unaffordability (unequally distributed geographically, of course). The problem is that market rates must support a number of (often unnecessary or inflated) concerns, including but not limited to permitting and litigation. Profit for a rotating cast of securitized mortgage holders is another major one. Insolvent municipalities that can't see property taxes fall is another.