The last episode of a show that clearly had no direction and had no idea what story it was even trying to tell. Hoping to wrap things up in a way that didn't make the showrunners into liars for saying "It's not purgatory" in 2005.
Everything on the island was real, including the smoke monster, Jacob, Locke being able to walk and Fat ass becoming God.
This show was a mess, a total mess. Trying to make sense of it based on some throwaway line in the last episode of a garbage TV show with garbage writing is terrible. It was fucking Purgatory. Except it wasn't, because of all the shit that happened in the early seasons. Except it was because of all the dumbass "sideways flashes". Except it wasn't because of submarines and Polar Bears and science experiments. Except it was because they've been dead all along. Except. Except. Except.