Hmm, I haven't heard of this method before. But, I have tried a "preformulated" wash with surfactants in an oil base rather than regular shampoos with surfactants in a water base (or, more rarely, in an aloe vera base). It worked pretty well but it was harder to get it to suds up. It was more moisturising than most shampoos in a water base.
Personally I do
pre-poo and some people on here a die-hard
rinse out oil fans.
Pre-poo: oiling up your hair before washing it (or conditioner)
ROO: adding a small bit of oil to your hair after shampooing but before conditioning
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