Wasn't that when we were still under level 4,3 and then 2? So most people were isolated anyway. The problem we now have is that we are in level 1, which is essentially back to normal internally, so there is significantly more mixing going on.. I am guessing that is one reason they are now requiring more testing, to reduce the risk at the border even more, as these additional testing requirements appear to have come in as we moved down to level 1.
The should be zero cases getting through the border into the community. If one does, then that indicates a hole in the system.
More mixing in a covid free environment.
The extra testing appears to be a result of frenzy. I isolated, no one tested me. That worked. Isolate the arrivals, test if symptoms so you can add extra care for the infected. The rest of them that are not infected wait it out as part of national security. Then they go.
Yes, zero cases should get to the community. As they get tested negative before they head to the cafe.