He's being derogatory, fulling knowing EXACTLY why he's correct. He's simply not getting the same rhetorical effect if he calls it "Christianity" or "Scientology" or "complete nonsense", despite those all being, contextually, synonymous with homeopathy and witchcraft.
I was going more for the similarity between the power of placebos and the ability of people to believe they have changed the world by brainwashing themselves, but I'm sure you are quite correct about his reasoning on the matter.
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