"'Five years ago I threw them out of the homes they had fought for every bit as fiercely as anyone in Quel'Thalas today,' he answered. 'How do you think they reacted?'"
This goes against everything I knew up until this point. Almost all sources detailing the High Elves hold that they left on their own accord not wanting to be caught up in Kael'thas' mad scheme.
I don't know if these short stories are cannon or not, but implying that the High Elves were forced to leave because "'we refuse to suck magic from living things like vampires'" spits in the face of the notion of division on moral grounds.