> Hitman's main campaign and bonus missions can be played offline, but content including Elusive Targets, Escalation missions (bonus levels and challenges made by developer IO Interactive) and user-generated Contract missions require an online connection to play.

I think this article misses one of the major issues here. While yes you can play the entire campaign offline, you do not get access to the progression system. Sure you can beat the game with the very basics, but that isn't really the core of the game imo. Replaying levels with different strategies(weapons, tools, outfits, starting locations) is the real meat of the game.