The original problem didn't specify how long you'd continue to believe the falsehood. You do, in fact, believe it, so stopping believing it would be at least as hard as changing your mind in ordinary circumstances (not easy, nor impossible). The code for FAI probably doesn't run on your home computer, so there's that... you go off looking for someone who can help you with your video game code, someone else figures out what it is you're come across and gets the hardware to implement, and suddenly the world gets taken over. Depending on how attentive you were to the process, you might not correlate the two immediately, but if you were there when the people were running things, then that's pretty good evidence that something more serious then a video game happened.