Earlier quoted context omitted.
But: he's still giving investment advice and he still doesn't realize just how lucky he got.
You mean MMM or the author here? How do you know he "got lucky", since he doesn't mention how he got his nest egg? (Yes in a wider sense lucky to be born smart enough for a good job, in a country with good jobs and so on, but that applies to many people). Maybe he took those FI blogs seriously and dedicated himself to reaching that goal, and he did. And then people who never tried say "he got lucky".
My problem with most of the advice from FI and FIRE blogosphere is that it essentially boils down to "be the 1% (where you live) and live frugally". It's not wrong, per se, but it isn't actionable advice for 99% of the population[1].
In particular, while anyone could be MMM, not everyone can be MMM: There simply aren't enough people who read financial advice blogs to support a significant population of such bloggers living in rural LCOL-ville. Even if there were, someone has to stock the shelves at Walmart. Shelf-stockers simply don't earn enough to retire early, unless shelf-stocker wages rise to a level that makes blog-FIRE unsustainable.
It's sort of like asking why everyone doesn't buy a rental and become landlord. Who rents the apartment then? Or do all the landlords rent apartments from each other?
[1] Perhaps it isn't a 99/1 split. Maybe it's 90/10. But it sure isn't 50/50.