what?
If you don't provide the evidence yourself, then we have no reason to assume the evidence exists. How do you even go about proving something doesn't exist, anyways? That aside, the resistance to EoD is because of
Anos' magic resistance (and I vaguely recall the WN having different power levels at play, not sure if that's the case here), not because his mind is in his source or whatever.
It just says he upgraded Anos' spell, we don't have a reason it suddenly stops being necromancy and starts being mindhax just because it became more potent.
Also, the text says they're ghouls, which are also undead, soooooooooooo :v