Here are a couple western think tanks who evaluated recent Chinese economic stats - CSIS in particular comprehensively reverse engineered Chinese GDP reporting from ground up- and concluded China is (1 trillion USD) larger than official numbers purports to be.

Whole "Appear weak when you are strong, and strong when you are weak” Sun Tzu thing.

Broken Abacus? A More Accurate Gauge of China's Economy https://www.youtube.com/watch?v=vOxIJMjZOUo&

Louis-Vincent Gave: China- myths, propaganda and realities | SKAGEN New Year Conference https://www.youtube.com/watch?v=w9hFAlqKmfM