User blog comment:J Fan/Idea about Barbossa in POTCO/@comment-996391-20130109120707/@comment-1984959-20130110003746

So would be saying that he was resurrected. We know that in Dead Man's Chest, but not in POTCO. I talked to some folks down at POTCO Wiki and they believe it's possible as well. An example brought up was the Ghost Boss Foulberto Smasho, who could not leave the Cave of Lost Souls because he was cursed by El Patron. Same can be said with Barbossa as he never leaves Devil's Anvil, so it's possible to say that he couldn't leave until Tia Dalma "frees" him.

But as I stated above, it was just an idea. Though it's hard to say which is true or not, as both resurrected and ghost claims have their falseness.