Considering their apparent desire to control the world’s economy, it is suspected this display is to reinforce the notion that they will succeed without fear of military interference.
You can see how China's economy is outpacing Americas.
United States 6.03 percent growth January 2021
China 8.44 percent growth January 2021
As of 2021, the United States and China would occupy the first two places in both methods' gdp ranking. The US and China's margin is coming down in nominal ranking as China's gdp growth rate of 2021 (8.44%) is higher than the US's 6.39%. On a nominal basis, the US is ahead of China by $6 trillion in 2021 compared to $6.2 trillion in 2020. On a ppp basis, China has overtaken the US in 2017 and ahead by Int. $4 trillion, and the gap is increasing. China will remain the world's largest economy on a ppp basis over the next few decades as 2nd ranked US is growing slow and 3rd ranked India is way behind.