The damage on Aery isn't going to go down

At least not by any noticeable amount if you're buying resist pen of some kind.

Her adaptive damage was previously bugged, dealing the damage type that would do LESS damage rather than more. So as soon as you get Sorc Boots or a Dirk, Aery's damage will be as good or better than it was previously.

She's still going to be a better choice on most champs than Meteor is. The two Keystones are just too similar right now. Riot needs to better resolve them from each other so they both have VERY clear use cases.