Is Ahri's Boon an econ augment?

Ahri's Boon grants gold, XP, or interest — yes, it's an econ augment. Your team gains 2% Attack Damage and Ability Power per level.

Ahri's Boon

Gold augment

Your team gains 2% Attack Damage and Ability Power per level. Gain 2 XP each round for the rest of the game.

See all gods.

Ability Power

Scales with Ability Power (AP). Champions and effects flagged as AP-scaling get bigger damage, healing, or shield values when the holder stacks AP from items like Jeweled Gauntlet, Rabadon's Deathcap, and Nashor's Tooth, or from trait bonuses.
Xp

The player-side progression resource. Spending gold on XP buys it; each level raises the team-size cap and shifts shop odds toward higher-cost champions. Augments grant XP directly or trigger off "level up" to accelerate the curve.