I don't really have an opinion on the conclusion, but it seems like some of the supporting charts are weak. For example, new housing per capita doesn't indicate

I don't really have an opinion on the conclusion, but it seems like some of the supporting charts are weak. For example, new housing per capita doesn't indicate shortage, and in fact I would expect this metric to fall to zero in case of a housing glut. What you really want is new construction per new households, ideally, or at least per new population. You don't need to build new houses for your existing population.