Harbinger drop

Hello there...

The wiki article on harbingers explicitly states, that item quantity (either on area or player) doesn't affect the harbinger drop. It does NOT mention item rarity, though. Now,usually those go together right? So I wonder: Is it a laps in the article, or does item rarity count into the harbinger drop?
If I use a juiced map, like an 8-mod-corrupted, is the chance for a fracturing orb higher than in an easier map? Do eldritch altar mods +X% to item rarity increase the chance for a fracturing orb?

Quantity may not affect it, but packsize does, so a highly juiced 8-mod will give you better chances, yes.

Thanks