The descriptive text is cut off for some reason, so it doesn't explain what this is. It's mostly a multiplayer mode that wasn't ported to GOG's netcode. The gamecard for Prey: Digital Deluxe Edition has a note: 'This version of Prey does not include the multiplayer DLC - Prey: Typhon Hunter.'
It also has TranStar VR, 'a single player VR-only campaign included in the Typhon Hunter update. This campaign puts you in the shoes of various TranStar employees as you complete objectives and solve intricate puzzles on Talos I, just days before the events of Prey.' As far as I know that isn't in GOG's version of Prey either, presumably because of a SteamVR dependency.