I notice when pausing it at :52 as they fill the radiator with water, that you can see the whole engine bay. Dust and dirt cover most everything except the air intake plenum and possibly the throttle body. Those look brand new, or at least clean. Stark contrast with the rest of the car. I wonder if they used their axes when they replaced those off camera?
Americans always try and pull new bits out of Bush Mechanics and this episode of Black As to try and call fake. But ten points for spotting something that wasn’t in the reddit thread for this video.
Reality is, this is a cut down clip, and you miss two important bits of context - first, that this is an outstation, which the community out that way will regularly use as a combination between a rest stop, an overnight shelter, and a junkyard/communal parts dump. But yeah, the probably did - in the full version, you also get shots of them scavenging other vehicles for parts. It’s a part of a doco about some aspects aboriginal life in East Arnhem land, not a documentary about fixing junked cars, which is why they’re not spending too much time on the exact details of fixing it.
Seriously, it’s an outstation that’s hundreds of miles from the nearest parts store. What, you think they just popped out to the local Pepboys(Or, Repco around here) for parts?