If one looks at the world's major economies and the state of the world economy today, China is still the top dog (not meant to be rude) in term of GDP growth rate. And this in based on US dollar, let alone ppp (purchasing power parity).
The simple fact is that the Chinese economy is doing just fine despite Trump's sound and fury, but Western media needs to make it look like China is suffering. They haven't got much to work with, so this was the best they could come up with.The Chinese economy has consistently increased at around 8 trillion dollars a year from 2016 till 2019. Since the base number increased significantly during that period, the percentage of increase will decline as well. Basic mathematics really.