Why do you say that? Using official exchange rates would almost double the UK's GDP for example. A pound in the UK spends just about the same as a dollar in the U.S. Purchasing power parity brings the numbers back to reality.
Exchange rates attempt to reflect market value. China is a developing country, so it’s exchange rate is low, and its GDP when converted by exchange rates reflect that. Otherwise you potentially inflate China’s GDP and wealth (which is what the World Bank did). China is still a poor country, I think most Chinese are aware of this. It’s the Western Sinophiles who don’t.
All said, this could be a ruse to ease the pressure on China to revalue their currency among other things. Americans and other Free-Worlders can’t afford to put their guard down even for an instant.
Duncan Hunter shows the way!