At a macro-level, Chinese federal statistics are decently trustworthy in the 2020s, and there is enough transnational trade and dealflow that egregious tampering can and would be caught, and is very damaging.
> China could collapse at any time
There is a difference between stagnant/slowing growth (which is what is happening) and "collapse" (nowhere near that level).
Nor would you want to wish a Chinese "collapse".
It's because of rhetoric like yours that other Chinese people automatically dismiss policymakers abroad who are trying to push for reforms for an economically stabler China - which itself requires healthy engagement with the world.
You read the article above right?