This was found in the journal of William Bradley Afton, the CEO of Fazbear Entertainment who went missing in 2015 at the age of 73. The page was found alongside other nonsensical ramblings in the other journal entries, which could not be found, as William's house burnt to ashes due to old appliances malfunctioning and catching fire. The Houston, Texas police department released the only surviving journal entry in February of 2017. Later, in the Halloween of that year, Fazbear's Fright: The Horror Attraction opened and William Afton was pronounced dead
Credit to Scott Cawthon This is something i've been conceptualizing for months now.