Some hotfixes were just pushed to live servers which nerfs Nathrezim Infiltrators in Mythic+ dungeons by about 17%.
Nathrezim Infiltrator Nerfed
The Nathrezim Infiltrators in Mythic+ dungeons have been nerfed in some hotfixes!
Health reduced by ~10% to ~20%. This amount depends on your bag item level.
Damage reduced by ~17% on melee swings and abilities.
Vampiric Claws cooldown increased to 12 seconds (was 8 seconds).