So I've finally shaken off the lazyness to do this.
So Gojo's Hollow Purple was always thought to be able to negate durability and erase matter due to being described as an "imaginary mass" however, the tcb translator notes in chapter 205 states that Hollow Purple actually uses the same kanji as Yuki's virtual mass and that Virtual Mass is the correct translation.
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So Gojo's Hollow Purple doesn't negate durability, it just smashes through shit. Now the destruction effects when Hollow Purple is used makes sense, i.e the jagged canyon it creates in the goodwill event, 200% Hollow Purple smashing through buildings, Sukuna tanking it.
All of these don't really make sense if HP really erased matter.
So Gojo's Hollow Purple was always thought to be able to negate durability and erase matter due to being described as an "imaginary mass" however, the tcb translator notes in chapter 205 states that Hollow Purple actually uses the same kanji as Yuki's virtual mass and that Virtual Mass is the correct translation.


Jujutsu Kaisen Chapter 205
You are reading Jujutsu Kaisen Chapter 205 in English. Read Chapter 205 of Jujutsu Kaisen manga online.

So Gojo's Hollow Purple doesn't negate durability, it just smashes through shit. Now the destruction effects when Hollow Purple is used makes sense, i.e the jagged canyon it creates in the goodwill event, 200% Hollow Purple smashing through buildings, Sukuna tanking it.
All of these don't really make sense if HP really erased matter.