Does "-All Armor" create 1 debuff or 1 debuff for each armor type?

Does "-All Armor" create 1 debuff or 1 debuff for each armor type?

We know from this answer that skills/items with "-X All Armor" give a 5
second debuff on the monster that is refreshed if they are hit again
within that 5 seconds and continues to stack all the way down to 0 armor.
However, if I am playing a Berserker with "-200 Physical Armor" per hit
from the Shred Armor skill and my friend is playing an Engineer with "-100
All Armor" per hit, do they create separate debuffs (does the monster get
1 debuff saying -200 physical armor and 1 saying -100 all armor) from each
hit?
Or does the "-X All Armor" create 5 debuffs (1 for each armor type) such
that the "-X Physical Armor" stacks with the Shred Armor skill?