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And he volunteers a theory of his own, pointing to another Wuhan laboratory - run by the Wuhan Centre for Disease Control - located just a few hundred metres away from the Huanan Seafood Market.
It was known to be involved in the collection of thousands of blood and faecal samples from wild bats, research that was sometimes done without wearing proper protective equipment, according to Chinese news reports - a clear infection risk.

What I'm reading here is that China has realized they cannot continue denying that it came from Wuhan, so now as Plan B, they want to find an alternative explanation within Wuhan so the obvious answer (their bio-weapons program at WIV) still has plausible deniability.