The is bull. The IMF uses output in “real” terms of goods and services, meaning what would be the purchasing power of China adjusted for higher prices of the US. There is some validity to this but there are numerous (I think six) adjustments to make to GDP to equalize output which the IMF ignores. The biggest one is artificial lending often found in tightly controlled countries. China pumps the vast majority of lending into failing and stale state businesses. The IMF does not adjust for this.
Nominal GDP:
1 United States 16,244,600
2 China 8,358,400
3 Japan 5,960,180
4 Germany 3,425,956
5 France 2,611,221
6 United Kingdom 2,471,600
7 Brazil 2,254,109
8 Russia 2,029,812
9 Italy 2,013,392
10 India 1,875,213