No, this isn't Portal 3. Though it is a FREE game expanded upon Portal's preexisting story currently available on PC and the recently released Steam Deck. The game is described as a "short" as it has a playtime of 30 minutes; the game is also meant to showoff the Steam Deck's controls. The story within Desk Job is NOT canon and it takes place in an alternate universe where Glados seemingly doesn't exist.
Sources? Valve, Google, and various YouTube videos
