Is the latest newsletter the most certain statement on offline mode or has there been other official communication?
I'm just throwing this out there and I am genuinely sorry if I've missed something. The grey area in that newsletter, to me, was "connect from time to time". I'm not sure what that means. It doesn't sound like authentication to me.
I was never sure how offline could work with regard to exploration. It would of meant that an offline client would of had the entire universe on hard disk waiting to be found. This would of raised the possibility (and therefore certainty) of it being hacked and published, thus spoiling things for explorers everywhere. I wonder if the 'time to time' is some sort of exploration update compromise. Exploration is specifically mentioned as a concern. I wonder if a better compromise would of been limiting offline mode to a static, discovered only subset of systems. Then if you wanted to travel further you connected and got an update. That would still make serious offline exploration impossible. I never intended to play offline but I wonder if people who do/did might prefer that? But I think offline 400 billion star exploration is a huge problem whatever the solution.