I like that article primarily for the chain of insightful comments at the end. I think my conclusion after reading it the first time was that it takes every bit as much time to really "get" forth programming as it does any of the highly opinionated paradigms -- be it functional programming in a pure language like haskell, logic programming in prolog, or true OO in Smalltalk.

The deceptive ease with which you can write your own implementation lulls you into thinking that you really get it when you've written an interpreter/ compiler. But true cultural, idiomatic forth requires a paradoxically deeper understanding than writing the compiler can give you.

I think the author drew and settled his conclusions too soon.