It just seems out of the blue to hit him this hard. As is, i could see why you would nerf him slightly, looking at his stats. but keyword here: slightly, and not what seems like a humongous nerf. it really feels like something you'd have dropped on him during pre-hotfix juggernaut patch given its magnitude. so, just asking... why nerf him this hard?
For those unaware, the nerfs are as follows
Crystal Spires (Passive) Attack speed bonus lowered to [39-90%] from [43-160%]
Impale (R) total AD ratio down to .4 from 1