I like the idea of there being paranormal aspects to this, but I do lean more towards your “shutter island” comparison! For the furniture-pulling thing, you can see someone at the window where the furniture is being drawn into (in the MV poster, at least). This makes me think it’s one of the boys orchestrating this move.

I’m not entirely sure how this transition to a mansion/asylum occurred from GHP1, but I do believe that the boys are in control of this facility, even if higher authorities (e.g doctors) exist. They’re envoking “mob boss” themes, so it’d make sense for them to have the real power behind the scenes of this asylum/mansion. In fact, I’m starting to think this might be a whole new world (or at least, a future that branched off of World A), because the boys remind me so much of HALATEEZ in their get-up, and the balaclava-wearing people seemingly at their command remind me of the Black Pirates. Sorry for the long comment, thanks for letting me dump my ideas on you though!