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".
Are we talking about China or the Trump administration?
The tone and tenor of the investigation has always been to find a way to absolve local politicians of responsibility for their incompetence in managing this issue by blaming China.
All for the punchline of "so you're then going to do what to China in response?" Of which the answer is nothing. The genocide of the Uyigur people certainly hasn't motivated any strong international action.
The WHO chief just blindly parroted whatever the CCP said for nearly 2 months while the pandemic spread and got out of control. That man deserves to be stripped out of his position. But he will face no justice for the many, many lives he has taken.
The entire timeline of tweets and statements by the WHO is open on the internet - don't see the need to quote them verbatim here.
The only nation in the world raising flags was Taiwan - and their warnings were ignored until it was too late.