Yes, what changed was that the critical ingredient in the cocktail, Baska Snaps, a Malort-like Scandinavian bitters made by Bittermans, shifted its production site and, after that, the flavor profile of the product changed to such an extent that it no longer worked within the formula of the Boss Colada cocktail. According to Cane & Table owner Neal Bodenheimer, the new Snaps was too bitter. They couldn’t find a way to make the drink work anymore, so they eventually dropped it from the menu.
So, Boss Colada–a drink that was very popular at the bar and in New Orleans during its short life–can, at this point, be considered something of a phantom classic, never to be experienced again. It’s an odd situation, but perhaps one we will encounter more as the years go by. A great many new spirits have been introduced to the market since the cocktail revival hit full steam in the late '00s. And bartenders experimented with those products, creating new cocktails. Of course, every new spirit can’t succeed, so some of them–probably many of them–will disappear. And the drinks that required them will also disappear. We may end up with a situation much like what we had back in the early '00s, when we were desperately looking for lost ingredients in order to make pre-Prohibition cocktail recipes.