Droplet vs Aerosol Transmission
The 2m (or 1.5m etc) rule was brought in due to the likely
droplet transmission range and not the
aerosol transmission range. With aerosolisation the virus floats and so the virus spread is not limited to 2m, and also importantly is not temporally limited either as it may float till another catches it (Either by the virus floating to another location, or by remaining buoyant for another to intersect) whereas droplet will fall fairly quickly.
Fleeting Transmission
As has already been pointed out BWS, Butchers club all had direct customer to interactions between the cases of customer to assistant.
Pizza gate caused such a flurry at the time as it was thought to a possible fleeting transmission case from either droplet/aerosol/fomite spread. Subsequently it was shown that he had actually had longer contact.
While contact was not lengthy on those occasions, it was more than a brief and more than a few seconds and there was a known interchange between the carrier and the infected.
They were not fleeting transmission as Sutton was using the term, and as Gladys and Haddan both have now also used the term this week with the same meaning. It is not a Butcher Cub/BWS transmission type event.
The fleeting transmission has been reported for cases that where known to be in the same space, or nearby, at point in time or just afterwards (ie aerosols may have been floating and the fleeting is in regards to either the spreader and/ or infected person catching the virus in a very brief period of time (ie only a fleeting contact. So not say sitting at adjoining tables).
As Sutton reported at that time such fleeting transmission cases had not occurred in Victoria in previous outbreaks from known cases. He did qualify it that not all cases were known.
Haddan and Glady's having also joined Sutton recently in using the fleeting transmission/contact term in the same manner as Sutton was using it.
ie Haddan today:
"Each had stood not far away from each other for a very short period of time and then it would appear that one of them possibly moved through the airspace that the other one had occupied.
"That is becoming a fairly accepted situation now that this is the type of crossover event that can occur.
In short both the Delta and Kapp variants are considered to be more transmissible than many other variants, and moreso than the variants that had been in Victoria before (which are the variants that Sutton was comparing Kappa to).