I don't know Learning, but to keep things in perspective PBT2 was not the only hit compound
" The program has screened more than 50,000 of these compounds, identified 3000 possible new antimicrobial compounds of which 260 look promising for further studies."
http://www.uq.edu.au/research/impact/stories/so-long-superbugs-crowdsourcing-is-here/The Florey is just across the road from Royal Melbourne Hospital, and right across Grattan st is the Peter Doherty Institute for Infection. That is the location of The National Centre for Antimicrobial Stewardship (NCAS), a Centre of Research Excellence based at the Peter Doherty Institute for Infection and Immunity (University of Melbourne and Royal Melbourne Hospital) within Melbourne's Parkville precinct.
Hard to imagine they don't know about this.
https://www.doherty.edu.au/our-work/institute-themes/infections/summary