tri-sceptic

NOUN:
Someone, usually Australian, who doesn't believe in the true origins of Australia III - modern day Australia scientifically spelt Australiiia or called Australia Three.

and/or has failed to gain the common knowledge that there are/were two previous Australias (Australia I and Australia II also spelt Australia and Australiia respectively.

Reasons someone might be a tri-sceptic include (but aren't limited to):
1) Having moved from a different country and so wasn't taught of this general Australian Knowledge

2) Having had a change in syllabus/areas of study in Australian Schools

3) Having been educated at a school that shuns this history (most common are Catholic schools)

Person 1: Oi nahhh I theres only one Australia

Person 2: You dog, I didn't know you were a tri-sceptic
Person 1: