None of this proves that chinese estimates are accurate. you cannot prove your government's honesty by comparing some random figures with another country.
It is a known fact that due to the pressure to perform or show some number relative to other competitors, Chinese officials often cook these figures up. But even after adjusting these fallacies, China's massive growth and development cannot be denied.
If our stats are inaccurate you can bet Indian stats are 10 times worse. The level of corruption in India is like nowhere else.