No, not that.
There's a disturbing trend here. All of the other (now deceased) Bane weapons were tailored to creature types that we fight, but we have exactly NO ghosts with whom to cross our ghostbane swords, anywhere in the game. The only ghost I can think of is an NPC, and we all know it's really a kobold in a dusty sheet with eyes cut out. A couple of the Cove monsters are "ghostly", as are the skeletons in Delera's, but they are not ghosts. Why the absence of ghosts in a game where 50% and rising of all equipment is named for the poor dears?
There's only one explanation: the devs are Ghostists. They hate ghosts. They exclude ghosts from dungeons while at the same time creating enormous stockpiles of weapons to be used against them. I know, I know, ghostbane is generically useful against undead, but it's a bit of a poke in the immaterial eye to name them after a monster we don't even allow to play, isn't it?
Now that's what I call Exxxxtreme Prejudice.