If you scroll to the bottom of it, China owned up to accidentally leaking brucellosis mere months before Covid became a thing, sourced by China Daily (CP's English website). That's why I don't get the accidental lab leak hypothesis. It's inconsistent with previous ones unless you make some 4D chess plays in reasoning.
As for suspiciousness, is that action different than in other situations, or are we they just behaving like that all the time and most of the West is only learning about it now? I'm leaning towards the latter.
It might not even be something initially decided by those on top. Just as likely that the lab management decided to sweep it under the rug to avoid damage to their reputation, and then by the time it blew up, the higher-ups couldn't admit to being ignorant without damage to their reputation; and so on, all the way to the top. It happens all the time in bureaucracies.