Ahn's Contempt vs Guardians

I haven't seen anyone Using Ahn's contempt, I think it's the most defensive helmet in the game rn, with Belt of the deceiver, and indomitable 100% reduced crit dmg is easy to get. I've been going threw the guardians with it, and I definitely think it's endgame viable, the dmg isn't good but not having to dodge attacks saves time.

Ahn's Contempt vs Guardian of the Phoenix

https://www.youtube.com/watch?v=ZYuFQUZFzeQ&feature=youtu.be