What it is
The method works because it puts a pile of feed and a hookbait in the same dinner plate, every cast. Carp, F1s, tench and bream will settle over it. You are not waiting for a fish to find a single grain of corn in an acre of water.
It is simple, which is why people do it badly. The mix must go in sticky enough to survive the cast and soft enough to break down in a minute or two. The hooklength is short. The bait is modest. The cast is accurate. Everything else is patience and feeding rhythm.