No, there weren't 18 people on the one aircraft as the media tries to make it appear.
Where do you think the media got this figure from? How about this posted earlier by Dick:
Full radar coverage but no radar service provided. 18 could be dead.
As for the GPS data being out of tolerance, that bit of info was provided by the operator so thats what the ATSB will investigate. I can sense a certain amount of hysteria permeating the postings.
After reading that, who from the public would want to fly in anything other than that flown by the big end of town?
If a fatal accident at YHOT didn't put people off flying there why would this change their minds?