That’s coz China doesn’t know either.
In all likelihood it’s an accidental leak from the lab but communists don’t care about truth - they care about perception. So the first thing they did was to destroy any and all evidence that that’s what might have happened regardless of whether or not it did.
Their actions from January to March 2020 speak to the reality that they knew they had a leak or orchestrated one of the greatest gaslights of all time to trick western civilization into collapse.
China doesn’t know either.
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Taiwanese friends let me in on this WAY early as in when early reports, videos, and relatives in Chyna let news out and before Chyna shut off internet leaks. The area around Wuhan lab had a complete absence of cell phone activity twice for extended periods of time. An event in October 2019 has been widely reported and forgotten/buried. Media owners told the media “We own you so shut up. NOW!” So they did. Examples of the forgotten:
https://www.dailymail.co.uk/news/article-8302739/Cellphone-location-data-analysis-Wuhan-virology-lab-suggests-hazardous-event-October-shutdown.html