I am not sure if I understand him. Is it really difficult to buy a new car in Australia? He calls cardealer "your enemy". What is the problem with walking away from that specific dealer to another dealer?
Methods he describes are applicable to buying pretty much anything. If I am not happy with some seller I go to another.
Also, he criticizes pretty much every car brand from around the world. The only makers he is OK is perhaps KIA, Hyundai and Mazda. Absolutely everything other is a crap.
Actually buying a car is not difficult. Anyone can walk into a car dealer, fill out some paperwork and you have a car. The point John makes is that car dealers will often try to screw you, if not on price, make other false representations about a vehicle, just to get you to buy it. Their job is to get a much of your money as possible and a lot of them use high-pressure tactics to do so. Buying a car is a large investment for most people, so you really need to go armed with all the information you need to make a sensible purchase (not one that is driven by emotion).
John's videos are typically quite good, and largely based on facts. However he does let his personal biases creep in every now and again. He's absolutely right, when it comes to Chinese cars (Chery, BYD, Great Wall, MG etc...), they are absolute junk and to be avoided. But the same can also be said for brands/models all over the world. Cars are a bit like computers, there is no one "right" car, it depends on individual circumstances and needs. For whatever reason, John has some kind of soft spot for Subaru and tends to gloss over their weak spots. I've driven several modern Subaru models recently and my opinion of them is that they have average build quality, they are quite tinny, relatively powerless and the "smart" technology is bloody annoying to drive with. Mechanically, they might be a solid purchase, but several models are known for their "electrical gremlins" (notice how many Forester's, Outback's and Impreza's have faulty tail lights, for example -- Once you see it, you can't un-see it!).
Anecdotally, I've noticed a huge uptake of Subaru's mostly by those who are in the older generations. All around Sydney and indeed other parts of Australia, if there is a queue of traffic in the right-hand lane, typically there is a Subaru driver at the front holding everyone up.
EDIT: I just realised this is an old thread that I commented on earlier. I still maintain my comments above.