The tricky thing is that it's impossible to distinguish between "accidental release" and "standard zoonotic transfer," unless you're able to track the transmission chain to patient zero. China could possibly do that (though it's not guaranteed), but if they did and it was clearly something that was accidentally released, obviously that's not something they'd ever announce, so it'd look exactly the same as the current "we don't know anything" state.

And all the ambiguity means any stance on accidental release vs standard zoonotic transfer is going to be driven more by politics ("China is evil!" "No it's not!") than by any empirical evidence.