And their 2% version has 17g of protein: http://www.chobani.com/products/c/lowfat
I imagine the difference is only because the fat displaces some of the protein in the low fat version, not because there is some special "high protein" quality to the nonfat.
I continue to be baffled by Americans' obsession with nonfat products, when nearly all current nutritional research says there is nothing wrong with fat, and that in many cases it's good for you.