If you lived in say Turkey or Argentina today, would you put 40% of your assets in the bond markets of those countries? Of course you wouldn't. What this article is actually telling us is that we should only be buying bonds in currencies that are used as world reserve currencies. We should not be buying bonds where they are floating their own bonds in somebody else's currency. Those are speculative instruments and nobody should be using them in a retirement portfolio. Therefore bond traders, not for people trying to live off their portfolios.