It doesn't even pass the sniff test. Why assume that a virus originating in wild animals which interact with humans reached humans by escaping BSL-3 containment, rather than by wild animals interacting with humans?

Especially given the prior form of this conspiracy theory having held that the virus didn't merely escape from a lab but was created in one, I'm suspicious that what we're seeing here is an attempt to sneak that original, stronger claim in on the back of this weaker version.