Sunfish, peer reviewed doesn't mean, "an unqualified person on an anonymous pilot forum is certain that this will pass muster"
Surely you would have learned critical reading and paraphrasing before you did your PhD on epidemiology?
There is nothing in the abstract or title of this preprint, (which was done on sample n=903 about three months before the quarantine breach) that indicates "Latest advice is that the Melbourne outbreak is caused by a mutation that makes its C19 strain the most infectious so far on the planet."