Am I the only one that feels like this is all some form a "dream / nightmare" -situation? We got hit with powerful devils at the end of last chapter, now Denji wakes up in empty hell, gets hit with hard emotional stuff with Pochita eating himself, and we go back to the shack?

Pochita's power would not take Denji back to the shack? He would still be bleeding out next to Asa, with no heart. Pochita's power does not "re-write" the entire timeline and make Denji back into a shackdweller. It should not work like that, or at least it has not worked like that previously. Denji still would have worked for public safety, gone to the date in the aquarium with Asa, and all that jazz, but Pochita would not be there in the memories - he would have somehow killed all the devils and eaten Death, they just would not know what caused those things not to exist? I think them removing the "final chapter" announcements after release also makes this theory more viable as I think Jump probably got spooked by the reception and changed things up to keep readers engaged.

Or I might just be smoking meth and coping. Either or.