Earlier quoted context omitted.
I prefer ftalphaville's take: http://ftalphaville.ft.com/2015/08/11/2137067/this-one-time-... There is a massive but officially not permitted capital outflow from China that's pushing up real estate markets around the Western world. To some extent we're paying for our imported manufactured goods from China by exporting house ownership and rent payments.
Which is actually nice for the US, since Chinese buyers can't pick up a piece of real estate and bring it back home with them, and the ownership obligates them to pay taxes, etc. It hurts the domestic home buyer, though, who has to compete with inflated all-cash offers from these foreign investors.
In theory you're right, and they often do pay taxes, but there are many schemes where the foreign investors pay zero taxes. There's no incentive on the industry's part to showcase or investigate to what extent this occurs, but we know it's pretty prevalent.