No, spells that make a save roll against magic usually *don't* affect Illithi. What's being said is that this particular bunch of Illithi are susceptible to 'em. That's because otherwise, it would be much, much more difficult to affect a rescue mission for Phaere.
I recommend throwing a few summoned bodies at the Illithi, first. Typically, they stun, then move in for the kill. While they're circling like vultures, they can be attacked quickly, up close.
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