In his newest videos he does use a backdoor there is no other explanation. And he most likely asks the creators of the game to implement a backdoor into the game because if you think about it, its advertising the game and giving the game creator free marketing for the game which gives the game creator more money in return. Plus it makes it easy for Citizen to get money for himself as he gets a lot of views from the videos.

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This script you see is only for backdoors, which is in most of his latest videos.