I thought so too, kind of like a why house prices in NZ are so high for dummies.
I think you said supply was the biggest thing, and I agree with you - especially the bit he talks about the big apartments in Sydney and Melbourne, which sounds like that helped a lot. Just a pity governments appear to be too scared to act on it - I can see homeowners jumping up and down if their house drops in value, but at the same time that does nothing for first home buyers.
Incentivise builds, over time that will ease demand, if prices went down slightly every year as building was the no brainer option, affordability will slowly catch up as wages rise slowly and houses decline slowly. Its probably time to get serious with tiny homes, or design smaller homes with larger and covered decks so the interior is ok for living in, but on nice days the overall house is bigger. Creative stuff like that to get more bang for the buck. But invariably, ideas usually just end up in media articles not on plots of land