Well, what's wrong with the interpretation these are deformations? You come to the conclusion - and many others, including myself - these are beetle carapace. You've played the games; you have an image in your head, of what a Dark Elf is "supposed" to look like, and you know, from in-game experience, they are not deformed, but they look like the other dunmer.
What would the point of that be?
Monkeytruth, aesthetics, argument, new points of view. He knows better than I.
For Mr. Quimper, the world of Tamriel is captured in the art, not the screen shots and game play, so he'll ignore the games and sources which don't agree with his Tamriel. He's only interpreting the art, no Daphnia included, which we can't assume a Dunmer has seen, in the first place. Trying to convince him, these are not deformations, caused by necromancy, but instead ceremonial shells, using only MK's artwork and MK's writings, is an exercise in futility.