Sure, they exist in both the lowest (so far) level and in the next level up. But Eliezer wants to forbid things at "higher levels of simplified multilevel models" from existing out there in the territory. If that doesn't include electrons in this example, then I don't know what it includes. I don't understand exactly what it is that is forbidden. Is it type errors - confusing map entities with territory entities? Is it failing to yet be convinced by what someone else thinks is the best low-level model? Is it somehow imagining that, say, atoms still exist in the territory while simultaneously imagining that atoms are made of more fundamental things which also exist in the territory? I seems to me that the definition of reductionism that Eliezer has given is completely useless because no one sane would proclaim themselves as non-reductionists. He is attacking a straw-man position, as far as I can see.