This is only true if you limit your choices of homes to popular areas. Homes out in the country are usually easy to come by, especially with the salary of someone working in tech. Now, if you want to live in a big city, this is obviously not true, but this is arguably a livestyle choice to spend money, which you then need to earn [0]. If you love farming more than anything, moving to flyover country and make your living doing that is entirely possible, which is the point PG is making.
[0] I don't mean to say that the housing bubble is not a bad situation, but this does not invalidate the argument.