The idea is plausible, but testable. I am sure they've gone in and sequenced the DNA in this bacteria's genome and found the genes which confer antibiotic resis

The idea is plausible, but testable. I am sure they've gone in and sequenced the DNA in this bacteria's genome and found the genes which confer antibiotic resistance, in addition to doing the lab tests showing that it can survive exposure. DNA sequencing is pretty much standard procedure now when looking at previously unknown organisms. Think about it. How would they even know that this organism is something new without comparing its DNA to the other DNA samples microbiologists have collected? If they hadn't done this, it would be a non-story.