The only thing with the whole 'it came from a bat' theory - which I do believe is correct - is that the bat species they are suggesting this came from does not actually colonise within 100 miles of Wuhan. At all. Ever.
And - apparently - there has been no record of this type of bat being sold in the wet markets (but how that can be judged I don't know).
However, one of the Wuhan labs was doing research into coronaviruses and - this is according to a study by a Chinese or Hong Kong-based University, I forget the exact one - these bats were recorded to have been part of the research there.
It's probably as likely that it was an accident - i.e. someone in the lab became infected, then infected the city - as it is that it originated in the wet markets. Maybe it's even a bit of both. We'll never know for sure.
I don't believe it's a bio-weapon. But there's probably too much coincidence for it just to be from the wet markets.