Is US GDP overstated and Chinese GDP understated?

I truly believe that Chinese nominal GDP is in reality, 2.5-3.5x the size of US nominal GDP.

Supporting evidence:

- Companies listed in geographical locations bolster national GDP due to reporting global revenue (Ex: California getting bloated GDP figures due to international tech companies in Silicon Valley)

- China has far more cash and precious metals transactions (unable to be taxed, reported, documented or even estimated)

- US GDP is mainly intangible products/services (software, legal, financial, consulting, marketing), which tends to bloat GDP further

- China has been understating GDP since the 1980s and 1990s to avoid repayment of IMF developing nation loans. (proven)

- Satellite imagery of urbanisation and light pollution indicate economic growth is far higher than what Beijing reports

- RMB to USD exchange rate is manipulated and kept artificially low by Beijing to keep exports profitable (affects nominal GDP calculations)

- Chinese geopolitical doctrine has involved understating its economic/military potential since the Qing Dynasty 

- China doesn't count prostitution, drug trades in its GDP figures or stay-at-home spouses as domestic servants unlike the US, UK or Japan

Is the US deliberately bloating its own GDP/China deliberately understating its own GDP for each of their interests (US hiding its decline, China hiding its wealth/military spending)?