From the nypost article https://nypost.com/2020/08/15/covid-19-first-appeared-in-chinese-miners-in-2012-scientists/It seems pretty clear that the virus was first transmitted from bats to humans in a mine. The samples taken from the miners were taken to the lab at Wuhan, from which it seems the virus escaped and infected local people. That's what the evidence indicates at this point.
"The doctor also sent sample tissues from the miners to the Wuhan lab, a focal point of coronavirus research in China. There, scientists found the source of infection was a SARS-like coronavirus from a Chinese rufous horseshoe bat, according to the thesis.
Latham and Wilson believe the virus — once inside the miners — “evolved” into SARS CoV-2, “an unusually pathogenic coronavirus highly adapted to humans,” and the samples somehow escaped from the lab last year, launching what has morphed into the coronavirus pandemic."
According to a translated thesis , ok so far .
Miners or a single miner the virus evolved in ? See my next link quote .
Escaped from a lab that does gain of function research and quote “an unusually pathogenic coronavirus highly adapted to humans,” Pretty amazing , that would happen .
The Mojiang Miners Passage Theory and The Lab Origin Question
Quote from this article .
This is the idea that one or more bat coronaviruses evolved inside the body of one hospitalised miner into SARS-CoV-2 (or a very similar virus). Our theory requires that perhaps many hundreds of mutations (and by implication several decades of virus evolution) could have occurred in 6 months inside one body. To many, this seems far-fetched. Yet, in this talk, I point out how a number of recent studies have found that viruses within single individuals who have compromised immune systems and long term infections (and therefore are very much like the miners) can undergo startling evolutionary leaps.
I wonder where people get the idea that their theory could be far fetched ?