If false, then it's yet another viral mutation / species cross over which have happened all the time throughout history.
When I hear hoofbeats I think "horses" not "zebras"...
From what I've heard on Chinese social media, there are a bunch of plausible sounding theories.
For a lot of jobs in China, it's expected that there's moderate incompetence or grift.
For example, say the lab has a bunch of extra animal samples (mice, bats, w/e). Someone in the cleaning staff could make a few extra $ by selling those samples to a wholesaler at the local wetmarket (to be turned into dogfood, etc.); maybe they only meant to sell the clean samples, but got things mixed up.