The current occupants would seem to have a successful business running as it's fully occupied on many nights. We certainly enjoyed our visit.
I'm sure if it transitioned from it's pop-up nature to a more permanent undertaking then the secret part of the experience would naturally cease. As things are today the secrecy is an essential part of the business plan.
The operators have been clear from the start that they are happy to answer any questions from locals. I'd urge you to contact them.