No the ignore-con is to positive emotions. I think (I haven't actually had a chance to check myself) that it's only negative emotions that power the Chaos Gods now.
While Ordos Xenos does have some Eldar information they really don't have that much access to pretty much anything Eldar related except for a few (literally one to three people) in the last few thousand years. After all to the Imperium in general a handful of Wraithbone is a big deal. Or a single empty soulstone.