Curiously, the offline mode seems to be exclusive to the Steam Deck, and running the game by default on any other PC operating system still requires an Internet connection. Players, however, have discovered a way to trick the game into thinking that it is running on a Steam Deck, even if the player is on a PC running on Windows 11.
Pretty shitty of Activision to limit that to the Steam Deck only, good thing PC users are clever.