Devolver is streaming Absolver right now on
their own twitch channel. Feel free to drop by and ask them if the GOG version requires permanent internet connection. I tried asking, but the only reply I got (from a viewer, not an admin or Devolver representative) was "classic gog", probably referencing how this community gives off the impression of being a bunch of jaded old farts that'll bitch and moan about everything that isn't the original Fallouts or Baldur's Gate.
To be fair to people outside the GOG Forum community, maybe we should rethink the way we go and talk about things, because what people think about us is mostly correct.
Bottom line is that I'm still not sure the GOG version of Absolver will have a full offline mode. It probably will, or so does say on the game's GOG page, but will it end up being just a gimped version of the game? I mean, it's clearly being developed with online and social aspects in mind, playing it solo offline is far from the experience the devs intended. I've been watching a few streams of Absolver on Devolver's channel and I honestly can't see it working this good and seamlessly offline. Most of the "NPCs" that we encounter are other players, I don't think I've ever seen an in-game coded NPC, just mobs.
[EDIT] I mentioned the lack of NPCs because one of the main focuses of the game is this "mentor-student" relationship; we encounter mentors and students on our way to become an absolver. If there are no offline NPCs, the only way we can get mentors and students is by going online and playing with other people, thus rendering the fully offline version "inferior", especially considering this mentor-student relationship is supposed to be a huge part of whatever story the devs are including in the game (the path to become an absolver).