Honestly, I'm not a bio expert by any stretch (unlike Bill Gates). However, I do understand electronic circuits, AI, physics and a little quantum mechanics. Self assembly is probably a dumbed down description of some other process I don't understand. I believe nano-bots is also a dumbed down euphemism for some other type of process. For instance, "artificial intelligence" is nothing like the euphemism suggests. There is nothing intelligent about AI. The algorithms only appear to make smart decisions. They do not. All the algorithms do is rank input data according to how closely it matches a known model. They do it very quickly though. The illusion is the algorithm is intelligent.