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".
If the penalty for lying and being caught is the same league as screwing up, people are going to cover up problems.
That is to say, if the punishment for any kind of crime is death, no matter how serious or how trivial, you might as well go ahead and commit the much more serious one and try and cover that up instead.
Either way you're fucked, so why not go all in?