in other words, they buffed ifrit's resist rate. And other mobs as well.
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Except no, resist rate means a mob has a inherent resist to something, typically meaning it has a chance to resist said debuff at any given time. Diminishing returns is the same across all mobs. Outside of ones immune to stun. And even then, it would still apply, they just have a flag saying stun does not work.
So, no, they didn't buff Ifrit. They actually reduced his Eruption damage. And it's more of a fix anyways.