That's not the point. I had made the claim that prefixes like these did not take en dashes, and Anderson objected. It turns out he was correct: they do, at least in (some) texts which use disjunctive dashes. I suspect that this may not be as common as en dashes with independent words, but that would be OR. Since you have no RS for saying they don't, we shouldn't change the MOS to say they don't. —