Tenacity incorrectly shrugging off Claire's buff immunity

I'm running the tenacity path in act 6.4.6. The tenacity node clearly states it shrugs off debuffs, however it is shrugging off Claire's buff immunity as well.
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99% sure it is a debuff you apply to stop opponent from gaining buffs.
It says she INFLICTS them
They are both Debuffs, and they can both be affected by Tenacity. The difference is that Fate Seal Nullifies Buffs, while Buff Immunity purifies/prevents debuffs, the way an immunity prevents them. It's a little confusing sounding, but it's this way so it interacts with certain nodes/masteries/abilities.
For instance, some nodes and abilities will only trigger when a Buff is nullified, and this does not affect that.
@Kabam Miike probably shouldn't refer to immunity as purify, as the only player-facing meaning for "purify" is closer in meaning to "nullify" not "immunity" in the context of debuffs (See: Void). It is just that the game engine implementation blurs this distinction.