He advocates for prioritizing your health, do cool free stuff instead of cool non free stuff and do not be too materialistic. The more you read, the more you understand this is not even about saving or retiring early.

He retired early by having a high (but not sky high) income and saving like 50-70% of it.

Nothing he did is unbelievable, you can't apply everything but you can apply a lot and it really gives benefits, no matter if your goal is to retire early or not.

Plus he doesn't sell anything and doesn't fool anyone to earn money. :)

Wasn't the whole Money Moustache thing based on the fact that he and his wife had both a good income to start with?

I read many things in that direction.

"I made millions with real estate! I simply bought a flat, refurbished it and then either became a landlord or sold it for much more money! It's so simple even you can do it. I started with getting like 50000€ after an car accident..."

"I retired with 40 and you can do it to, you just need a job that makes you 100k a year..."

I think he has an article that covers his finances from when he started working to when he retired. The short answer is double tech incomes and very limited spending. If your household is pulling 250k and living off 25k a year it makes retirement a lot more attainable.