They should not if we stick to RAW, I am unsure whether it is a bug, or is it intended. But honestly ? I think it's an interesting way to give them a little bit more utility (although they should be limited to abjuration and evocation).
It should not break the game either, because their spell slots are incredibly limited, and INT is still tertiary stat for them. With INT at 12-14, you are not going to use most of the spells anyway, at least not effectively, and the difference between EK having access to 4 useful spells, instead of 2 (You won't find more than like 4 anyway) is marginal power wise.