I found this to be an extremely engaging read and compelling story.
TLDR; The likelihood of it being lab related is high. The likelihood of it being directly malicious low.
My Take form reading it: The lab in question needed to collect bats for research. A person who collected the bats did so with insufficient safety and is likely patient 0.
So, its not quite as simple as a collection mistake.
Here is a direct link to some gain of function research being done at the lab for anyone interested: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2258702/
Relevant line in abstract:
> In this study, we investigated the receptor usage of the SL-CoV S by combining a human immunodeficiency virus-based pseudovirus system with cell lines expressing the ACE2 molecules of human, civet, or horseshoe bat.