However, your view needs more evidence and

observations on real scale of China economy to support your conclusion. 

My observation and estimate suggest that China 2018 GDP was much undercountered. The actual figure could be doubled or even more.

A simple example is that the Spring Festival month alone transports over 2.4 billions of people in the Mainland, which could create over ~$2.4 trillion GDP!  

More arguement may be found below.

http://bbs.wenxuecity.com/mychina/927324.html?backPage=0&backSubid=mychina