That's not what that measures, since you can look at the denser residential areas in large cities like Houston or smaller cities like Detroit, Baltimore, St. Lo

That's not what that measures, since you can look at the denser residential areas in large cities like Houston or smaller cities like Detroit, Baltimore, St. Louis etc and find the opposite. Only when you mix in downtown commercial districts that have residential housing (typically stacked on top of stores) do you see that. But the denser inner ring neighborhoods outside of a commercial zone are generally much cheaper than more spread out suburban neighborhoods where people typically want to live. So there is no correlation.