Is this known for a fact? I thought the bat angle was more a most likely scenario but not proven.
They eat lots of animals but bats are not one of them. (I'm sure there is a village in China where they do eat bats. It is a big country.)
The photos you see online of Chinese people eating bats are Tourist in the Pacific.
But this particular part of China does. It's more a subculture derived from one of the minority groups in that province, but it's there.
The original hypothesis was that some other animal sold at the market acted as an intermediate host between bat and human, just like the case in 2003 SARS, but this is also not proven.