QuoteI suppose we can use pleasure as a word that refers to a group of positive sensations the same way we use dog to talk about a particular kind of animal that is a member of a group of domesticated canines... without going down the Pleasure and Dog ideal form route. We just have to remember we're talking language and not philosophy (although, yeah, the line is fuzzy).
What DeWitt is saying is that pleasure ≠ sensation; that no pleasure is a sensation because pleasure presumes judgment ("I like this") and sensation is irrational and incapable of judgment. I realize that after a certain point this all begins to get a little nit-picky.