You insist always in the same argument rather than hear the opinions of others. Even in TW3 there are books which said that the Aen Elle and the Aen Seidhe took different paths and they weren't precisely friends. Iorveth could hate them just because the didn't help the elves when they need assistance. In any case, you are free to keep insisting in your own arguments
im "insisting" because its perfectly within his nature.. he HATES humans more than anything else. so If there were Aen Elves coming leading an invasion army, he would immediately join them and help them wiping out all humans. Aen Elves left for the same reason why other elves were against the Scoiatel units, so your assumption that he would be against them too is false.
What different path Aen Seidhe took exactly??? they decided to do nothing.. while humans took over the world... Iorveth and his Scoiatel units were actually strongly against such thing, and wanted to fight. which was main reason why they got manipulated into war with northern kingdoms by Nilfgaard and abandoned immediately when it suited to Emhyr. so my assumption that Iorveth and other elves that decided to fight, would join Aen Elle is valid