Re-define "Vastweld, the colossal Guardian" - Hitbox not offered for "Melee Attacks" or "Blocks"

Header says all.

Some emotional Information:
I dont do it wrong on other Bosses, this one, since he is apart from the standing Ground, only takes DMG from AoE-Splatters (like "Charging your own Wall"). Not by Mitigation from the "Attacks". And as much i love that Bosses work different and need Knowledge about what is a "Slam" a "Hit" and all these things, that Boss, is not playable by taking a tanky build like basing on "Unweavering Stance". I am looking forward to proof me wrong.

Greetings.