If China recedes by 9% and everybody else recedes by 18%, then it's surely possible.
Right now it's a race to see who comes out with the least damage. China is the frontrunner.
There is an another Chinese way to become largest economy. Over report GDP growth like China always does. Like china under reported , corona deaths hundreds of time, Like china over reports their GDP by 900 bn USD, China can be the world's largest economy.