execpt the only “high elves” in dalaran at that time were blood elves the silver covenant were part of the draenor expedition pre TBC they came back and the ones. as for the “high elf mages” most of them were in southen areas or away from dalaran or quel’thalas. so any elf who was seen prior to wrath was not in dalaran many did go back to dalaran the mages that is to help rebuild post warcraft 3 and pre wow. this acccounts for every elf who goes by the term high elf that we know of. had they been in dalaran which they werent they to would have been sent to be genocided by garithos. dude didnt just hate elves hated any non human race. see more of his behavior in the founding of the forsaken part of the undead campaign in warcraft 3 frozen throne.