I get the downvotes, kind of omitting his qualification in the very first sentence.

but if this really interests you it seems like an obvious opportunity for something like “the 102 impossible drinks” or something. figure out the DIY recipes and go to YT

> his qualification

Are you referring to "every" cocktail meaning "every IBA" cocktail? No complaints there, that's just headline writing.

But there's a reason I called out the Vesper -- it's on the list! And I'd argue it's the cocktail on the list that, most obviously, no one can make today. It's not a cocktail that allows creativity or substitution in its ingredients -- it's specifically a showcase of Kina Lillet -- and its key ingredient isn't available today. The correct response to someone ordering a Vesper should be "I can't make you that, but maybe you'd like a <something related>." (Or, honestly, "meh, we can do better than that" -- it's a mediocre cocktail at best, but that's not the point.)