They're very reliable because of their mechanical simplicity (intentional) which also makes them very easy to work on in the wilderness with a minimalist tool kit by design. Have never had a "failure" in 130,000 and that thing gets mechanically pushed so hard. Granted I maintain it very well due to the role is has.
But compared to Toyota reliability, that's kind of their whole reputation. And I guess outside of the few major cities, Australians aren't exactly surrounded by towns and workshops, so it makes sense they want the most reliable. The LandCruiser is, after all, an agriculture vehicle first, but with fairly good off-road capability as part of that design. They've been designed to be in the middle of no where farming for years and be able to limp for months if a part fails and can't be repaired any time soon.
Not sure why you'd pick one as a recreation vehicle, though, unless touring extreme remote is your main 4×4ing. I don't imagine every Australian is into that though. And even then, I'dprobably take an Ineos or a classic Unimog for the lols.