I think they're providing contrast against the hilarious suggestion that "a school is supposed to instruct kids in the truthful ways of life".
That said, "Truthful way of life" and "Glad plugins don't eliminate the cause of odor, just mask it which has a value all its own" seem to both be able to exist in the same space right? I haven't been to this school, but it seems most teachers aren't actively indoctrinating children to believe the "Big Scent" lie that candles/oil diffusion/whatever actually fix the cause of their problem rather than addressing the symptoms