You have just decided this. The whole enchantment was to boost its offensive ability to cut through celestial armor. That's it. Cut it.
Name any narration or context where they say "this axe designed for cutting is also a super duper blunt force absorber" beyond some flakes.
Let's roll with it. Let's say in fact, the celestial armor is allergic to jarnborn and flakes whenever it's close. It's still the force of Apocs actual fist being deflected. If I'm wearing chainmail or tinfoil around my wrist, my punch is still my punch.
Edit: the dude even said "I am more than my armor" implying it's defensive nature was hardly all he had going for him in his mind