Ungil's Harmony and new Perfect Agony?

Your Critical Strikes do not deal extra Damage causes the game to display a critical strike multiplier 100%. This would brick Perfect Agony. But the modifier does not say "Your Critical Strike Multiplier is 100%". Could we get some clarification here.

Yes I am very much interested to know this aswell.
Sense the new perfect agony key stone does say "critical strikes do not deal extra damage" which is the almost the exact wording on the amulete, it does lead me to believe it works perfectly fine together. However, a confirmation would be nice.