he means that when he tops for 2, he leaves the main leaders (top node), and clone leaders (node under that). later, after it recovers and shows growth, he removes clone leaders and.... plants them as clones. from there he works with only the 2 leaders of the main stem (splitting to 4, and eventually 8 ).
no one said this was a fast method. but I'd say its one of the few methods around that let you grow plants shorter than 2 feet from soil and pull more than 4 oz each off them. Yes, scrog can achieve this, but ever try watering 4x scrog plants per chamber? turns into a nightmare. mainlined plants are still mobile and thats part of the point. what do you mean by feeders? or Mold together? by keeping his plants smaller than one normally would, he maximizes the performance of his lights. I think the Original AOS pulled something like six zips. 48 zips to 1200 watts aint a bad score (more than a g per watt)