Dont believe too much on that. Even chinese leaders have a hard time believing their own numbers.
I believe that a whole lot more than I believe what Haterade-poisoned Westerners say. You have a problem interpreting articles. When an article says that some entity in China was caught doing something to puff up GDP, it shows that China pounces on this behavior to stop it as a bad apple. But people who specifically need to find ways to delude themselves to China's growth will say that this is a sign that China's entire economy is like the bad apple that was found, hunted down, and made an example of. It is basically the same logic that would assume that an entire country was made of criminals because a few are caught and sent to jail. Actually, China's gray market, unreported, untaxed transactions, is much larger than in the West, and China's stated internal goal is to underreport GDP in order to be considered a developing country for as long as possible.
On the other hand, Japan and especially the US are known to falsify economic data. In America's cause it even stupidly goes around publicly asking reporters to find ways to report the economy positively to drum up confidence in what is not there. America's economy isn't even calculated in a logical way; to appear larger, it adds nonsensical things like imputed rent, which is basically make-believe rent for if home-owners paid rent to themselves. China doesn't do any of this garbage; not only is the Chinese economy the largest economy by any honest measure, it is also by far the fastest-growing, most low-key, underreported and least boastful with the most potential.