Still, this is a useful update to my understanding of his techniques :)
In other words, Feynman himself never promoted that. I believe Feynman did extol the virtues of learning things until you can explain them to others.
I have seen many people use the real Feynman technique to good success. While I have to admit I've never quite used it directly, I can also attest to the virtues of trying to teach others to make sure you understand something yourself.
I have seen many people attempt to use the "write problem - think - write solution" method. Universal abject failure. It's a joke and it always was.
It's funny, because he was the very antithesis of that.
I think the fellow who writes waitbutwhy.com is using something like this.
Also, I once read an interview with the wife of Jonas Salk, the inventor of the polio vaccine. She said she met a great many people working in the sciences and technology, and the really smart ones could explain the heart of what they were doing in a clear and simple manner.