Pretty cool stories. I love theories and the like, although they are fake. It makes you think, "What if...?".
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They aren't actually saying that that is the actual back story of the show- they are simply speculating a possible intention, intended or unintended, of the "deeper meaning" (if there is one) from the creators of the show. Obviously the stories of how they died are made up based on how the characters act in the show, but the theories based on quirks in the show is the author of the passage in the OP's opinion, it doesn't even fall under fiction or nonfiction.