My own experience: Don't ever trust the Chinese government on issues that could potentially involve the reputation of the party. Note that I'm not saying don't trust what CCP says, ever (sometimes they actually do good things) - just not on issues that involve anything to do with how the world might perceive them.
Which is exactly what this issue is about.
That's not to say we have compelling evidence that this was a lab virus, either. I think, for me, it's a, "we don't know, but I wouldn't be shocked at all if it was a lab virus".
Or in this case, how covid19 export case numbers from places like Taiwan, HK, SK, Singapore, Australia, Newzealand all indicate Chinese numbers are not grossly exaggerated - China only exported a fraction of covid19 cases compared to Europe or North America because covid19 never exploded in China due to harsh restrictions. The article you're citing is also sourcing figures from _Chinese_ CDC on antibody prevalence rate which is expected to be higher than pure testing data seen in similar studies in other countries. So again, it's official Chinese numbers being useful and comporting to similar measures elsewhere. The difference is western media like BBC attempting to spin as the numbers being uniquely nefarious and useful idiots eating it up, just like in this NYT article.