Beware, remember one thing ! What was tested here is CRAFTING chance. (by the way, who cares about crafting those days ?) We cannot say that Crafting's Lady Luck proc rate is the same as Enchanting's Lady Luck proc rate (in fact, I'm pretty sure there was a experiement already that proove this wrong)
maybe he's dorf who crafts 10005000 packs/day and uses pot for more success in those 15s u can craft 50+ same packs and 20-30 diferent packs if u can navigate fast in your recipe list