He has taken things like DPT or DIPT and put them in the growth media and the fruiting bodies that came out contain 4-hydroxy-DPT or 4-hydroxy-DIPT instead of psilocin. In fact, he has a patent on the process. These active compounds are made by the mushroom so they really are natural and yet they never have been observed in nature. I'll give you even odds that if you put spores of a psilocybe species on cow droppings loaded with 5-MeO-DMT you would come out with mushrooms containing 4,5-HO-MeO-DMT. This way you avoid a 10 step synthesis by growing a psychoactive mushroom that contains no illegal drug.