True dat, Stone. The nutrients have to be there for the plant to use them. He essentially runs them all through the worms first, but whether you do that or add them to the soil for the microbes to break down later, they have to be there.
There's something magic about the transformation of inputs after going through the worms gut with all the special microbes in there and they come out covered in calcium carbonate slime, another thing that the plants love.
I'm starting to use that process myself, adding all the mineral amendments but also my comfrey, nettle, flowers, fruits, bug mix, etc. to the worm bin. Takes about 6 months to process so you certainly have to think ahead. I have a series of three stacked bins in the basement so mine go all year round.
Good stuff.