The fabled mobs in NToV have the same large loot tables as the regular version + its requisite fabled item. In spite of often listing much less in their drop tables. -Maybe Allah can change that.
So farming the fabled version of this for Abashi's Rod of Disempowerment isn't going to drop it any faster.
I hadn't thought much about the large loot table with other fabled mobs since Temple of Veeshan (and a maybe Vex Thal), raid mobs have very large loot tables, but the vast majority of fabled mobs have very small loot tables.
/sigh