Storenvy is just a marketplace (like eBay etc) - although from what I can find, they don't filter out scams/inactive sellers too well.
They *might* just have placeholder ads, for when they acquire stock - but that seems unlikely. Even 'normal' retailers (who will have greater buying power than some guy who's presence is ONLY on Storenvy) are listing it for >$900.
Can;'t say 100%, but chances are good, ordering from there...... you'd never see a GPU arrive at your door - especially not a 1080TI hybrid card.