I do think a 60+ years set of records, over heck knows how many sectors,millions?, is statistically valid, even if the number of aircraft in the Australia airline fleet was (and still is) miniscule, compared to US or other parts of the world.
Yeah, you might ‘think’ that, but that does not make it so.
Another 60+ plus years and the Australian fleet might get close to the bottom end of where first world aviation operators are today in terms of kilometres/pax/kgs flown.