Humorously enough, earlier he refers to those who believe that non-human mammals are not all conscious people as "extremists", so it's clear he understands this is not a fully accurate assumption.
Two separate meanings of "have experience" are being swapped interchangeably, I think: one is "brain can sense the world around the entity, react to changes, and act or plan actions", and one is all that plus "implements a person, or point of view, or subjectively aware entity that supervises experiencing", which is to say, a person. What it is like to be a bat could be rephrased as what it would be like to experience being a bat if a person were being a bat, but that doesn't actually imply that bats implement or contain a personal point of view. If they don't, then it might be that there is no "what it is like to be a bat", but at most "what it is like to experience being a bat as a person implemented by a system which is not a bat".