Assuming you have already posted in the Australian forum, and the senior editors you mention have already explained things, I'll try provide some opinions from a UK perspective.
Hazard reports made from the application have an expiry period to prevent the map being littered with reports that never disappear. The exact time span they linger is not known but can be influence by other users, confirming the hazard extends the visibility period, while marking it not there will reduce / remove it. The senioritory of the user may also play a part in timings. The screenshot above shows 63 users have confirmed the hazard, extending its visibility.
If your report is located on a road that gets less traffic or users that don't interact with the app, then there is little an editor can do, editors can only add full closures to the map. Editor can map hazards s these are done via the application. You describe 2-way traffic under temporary traffic light control, so the road is open in both directions.
In the UK we have an data feed that adds hazard reports of local authority works to the map that include known (expected) end dates, these therefore could be classed as semi permanent as they linger to the expected end date unless down voting removes them or users comment on them stating they are gone.