NOPE, RAW OUTPUT is the REAL METRIC of a economy. Nominal is just PPP adjusted the currency, So if the Yuan all the sudden strengthen against that dollar China nominal GDP will grow overnight.That's ppp not nominal. GDP ppp measures domestic purchasing power while nominal measures International purchasing power. 2 different concepts. China needs to surpass the USA in the nominal GDP to be seen as truly the largest economy.
If the dollar collapse this year due, IDK, some Middle East Oil crisis, China will become the biggest economy in nominals terms.