I think his point is that, dude, there's a lot of empirical evidence that by introducing certain electrical charges into a computing device results in certain o

I think his point is that, dude, there's a lot of empirical evidence that by introducing certain electrical charges into a computing device results in certain outputs. In other words, he's saying that when you say "You change the chemical composition of the body in X way, and this causes feelings," everything after 'way' is redundant.