This also has something, if not, a lot to do with millionaire farmers, mostly funded by incredible and often corrupt subsidies from the government. So before subsidies and pork, they would have made a more modest wage, but the game can be abused pretty easily. If its not designed to be abused because what benefits big agriculture also benefits medium sized "family" farms. Family farms may actually be a series of a dozen or more farms where the owning family does no actual farming on their own, but still live a rural lifestyle (pickups, bud light).

Secondly, its also skewed by government workers on fat pensions who can become millionaires pretty easily due to these collectively bargained benefits but also inflated salaries, especially overtime which is often abused in government jobs.

Lastly, a lot of this is self-reporting. Some people like to put on a modest front for their own reasons. The author got to see their pickup truck and muddy workboots, but not their Florida vacation home or Wisconsin lake house. Or the Corvette under a cover in the 2nd garage.

So some of the advice is hard to handle and not applicable to most. You can sort of FIRE your way into wealth and live like a miserable miser or hope you were born into a socio-economic culture where buying a lot of farmland is possible or getting a public sector union job is possible.