Not looking at the particular link but have been following some of the news around Australia.
I was one of the ones who caught covid in January with no idea how (similar to person mentioned above but that wasn't me.) I am high bmi and several cv conditions so we hadn't been in shops (Tesco delivery), didn't send kids to school on that day in January (had told school we wouldn't be for the foreseable but it only turned out to be one day.)
Only thing we did do was walking outdoors and we did that everyday. We were walking where other people were though, so I can only think someone coughed near me/ I was closer to someone than I thought/maybe walked in the stream behind someone.
When the covid people rang everysingle one of them said they regularly heard of cases like this (older people shielding who caught it outside etc) although it was obviously a tiny minority.
However as far as we are aware noone in my house caught it from me. I started several threads at the time as was completely baffled.
It obviously isn't usually the case or everyone standing outside a school would catch it etc but it certainly made me interested in Australia now saying it's possible.