"Playing with" as in "identifying and sequencing the virus in wild bats". The editorial notes say "The results provide the strongest evidence to date that horseshoe bats are natural reservoirs of SARS-CoV."
The location is... interesting, but it's also near a large wet market with a wild life section in a big city, pretty much exactly the circumstances you'd imagine to see natural transmission.
It kindles the imagination but it's not really a smoking gun.