Noone’s talking about lab creation, but rather the fact the research institution in question specializes in virology. So they would go into the field(/bat caves in this case) to collect virus samples to bring back to the lab in Wuhan to study (as that’s literally their job).
Mistakes happen, and a researcher could have simply been infected by one of these collected samples before going onto infect other people.
Well, I just read this article by Daily Mail, so we’ll have to see what the research says when it’s published.