It's been their policy to actively make glam/cosmetic items from previous expansions more accessible since HW either by shoving them into the quick venture pool or making them available through deep dungeon/exploratory zone loot.

Coils just ended up being a weird exception until now where they started shoving the related items into the Eureka Orthos bags, so the prices are going to tank anyways, just not as quickly as they would've via "nerfing" the instances proper.