This particular gentleman also lucked out in the early wealth lottery as well. Mr. Money Mustache is a frequent example brought up in most every "this is how to retire" threads, without mentioning that he was able to somehow accumulate over 3/4 of a million in the bank prior to "retiring".
It's also worth considering everything he (and his family) has given up to live on his "retired" salary - like health care, a permanent home in the city or suburbs, modern cars, etc.
In short, it's not just the rest of the world where this is not feasible.
I think he lives in Boulder in quite a nice house and drives a minivan. It's true that some people would rather have "modern cars" than retire earlier, but that's the whole point of the article
It's also worth considering everything he (and his family) has given up to live on his "retired" salary - like health care, a permanent home in the city or suburbs, modern cars, etc.
In short, it's not just the rest of the world where this is not feasible.