"It was reported in the press last week that OA had only just removed the tracking"
There's your problem Rudder, you believe what you read in the press. Air Nauru, I'm advised, removed the majority of the tracking somewhat earlier than the alleged article suggests - more like the 4 months ago you alluded to and from which you concluded that they'd not been doing much due to the minimally reported activity since.
Airliners.com even has lots of photos of departures and arrivals that Flight Aware doesn't list.
And of my question re VH-VLI and VH-INU??? They certainly flew but I can't find it on Flight Aware - SO, I guess you're right, if it's not there then they're not doing much!!!
It's probably time you followed your own advice which was "Lets get it right".