I'm feeling a bit more comfortable after the move to make NSW red zone.
The worsening situation in NSW is going to result in tighter management of people between states in Aussie, reducing the risk of people state hopping to get back to NZ.
Regarding the pre-departure test checking, yeah every test should be checked (actually pre-departure - at check in / boarding), but I don't think the issue is quite what the media has blown it up to.
Compliance is likely to have been very high regardless. Who is going to risk getting denied bording of their international flight (or getting put in 14 days MIQ on arrival, or facing charges in court) just to get out a AUD150 test? It is a reasonable assumption all the results were negitive, as a positive test would have been reported in the media (and likely notified to NZ health authorities given it was obtained for the purpose of travel).
Reality is pre-departure tests are just there to slightly improve our odds (they won't pick up very recent infections), so the difference between 98% and 100% compliance on the risk NZ is exposed to is trivial.
NZ has had a pritty good run in terms of our red zone boarder defenses (compared to aussie despite them sounding stricter). Hope we don't get complacent in that area.