Your etc is doing a lot of work here, but post COVID craziness aside I don't think building materials are more expensive than they were in 1990. As an example, lumber has been flat or slightly down since 1995:
His point is, the material standard of living is low as ever or even lower. This surprises people, but the bare necesities of the lowest level of maslow's heirarchy of needs are now more expensive than they have been in a long time.
Just look at the cost of shelter. Housing costs sooo much more than it did 50 years ago or even 200 years ago. During the time of Henry david thoreau, an average house cost 800 days of unskilled labor wages (meaning 800$, the average unskilled worker made 1$ per day). Today, it's over 5000 days of unskilled labor wages when you take into account property taxes. the difference in shelter cost is so enormous, that back then 1830s, mortgages were often just 10 years. And thoreau thought even that was too much.
That's not true at all. Most necessities (food, clothing) are far cheaper now in real terms than they were in the past.
Housing is more expensive on average, but only because houses have gotten much larger (the average new house was ~1000 sqft in 1920 and ~2600 sqft today), and are more likely to be in urban areas where land is scarce (20% urban in 1860 to 80% urban today). Of course modern housing is built to a much higher standard as well -- in Thoreau's time, the average home would not have had indoor plumbing or electricity.
You can absolutely find cheap housing if you're willing to live somewhere small in the middle of nowhere. But most people don't want to do that these days.
That's not because of material scarcity most of the time, it's because the US has very bad land use policies so we don't build enough houses for you to buy.
(And industrialization, like prefab houses, doesn't work because the policies are set by local governments so you can't produce a single viable product for all of them.)
https://www.lesprom.com/en/news/U_S_lumber_prices_in_2020_an...