Question about Lavianga's Spirits

I'm looking into getting a Lavianga's Spirits
Gargantuan Mana Flask as a way to get mana regen on a crossbow build as a new option.

it says it's 'not used' but does it still count as a flask effect? Does it still trigger nodes such as 'Stimulants' and 'crystal elixir'?

I can assume on use effect are out of the question, but these are worded as: during flask effect'.

And in minor importance: what would corrupting it possibly achieve?

Thanks for the info.