I think they all do, and I suspect they spend hours agonising to go with some interesting codex fluff from 2003, a story published in White Dwarf in 1997 and something a character said in a novel published last year. It's pretty tricky. https://twitter.com/DuskDawnGirl/status/1252691291705610248

One cool thing about being into Dark Eldar is - "Well he obviously lied/Unreliable narrator ;) "