The Demon - Div card drop location

My div card, The Demon, was introduced back in Blight league. Since then I've been trying to find out where it drops. We've seen one reddit post saying it was from Lava Lake Kitava boss https://www.reddit.com/r/pathofexile/comments/ermdff/the_demon_card_drops_from_lava_lake_kitava_boss. Has anyone else had it drop from Lava Lake boss to help confirm it's location? Has anyone seen any clips of someone getting a natural drop? This post is just a picture of the card in someone's inventory and I know people were speculating this as the location before the card was even introduced so I just want a bit more verification before I try to farm the card myself.

Bumping this. Where does it drop? Any clips?