That's interesting. But he doubts Hisoka has been left entirely without power, according to what greeters have told him. So that simply means it's something else, doesn't it? He doesn't doubt he'll learn about it in time, one way or another.

"Ah... unfortunate. But you should have your answer." His smile is mild as it ever was, confident that Hisoka will take his meaning out of what would sound like nonsense to anyone else, but it takes a slight edge when he speaks again. "The nen chains are still doing their job, but this place gave me a facsimile. I'm a blank slate."

A blank slate with as much potential as he'd ever had, given enough time and patience. That should be enough to recapture Hisoka's interest.