I dont think that is true, the only state that has ever mandated masks outside is Victoria and there was still a long time for most states to open back up to them after they started their double doughnut streak.
The fact is majority fo the spread in the NB and now the Croydon cluster has happened in homes, where even if their was a mask mandate people wouldnt be wearing masks.
Personally I think it would be mad to go to the cricket, not because of Covid but because it must be the most boring sport out of all the boring sports, Id rather watch paint dry
From the hints at this morning presser Id expect to see the crowd numbers halved again. The risk isnt the cricket, its the PT the way there, however that could easily be fixed by allowing free parking on the grassed areas of moore park and the EQ carpark for anyone with a cricket ticket.