Well, I don't think anyone thinks OC is an accurate account of what actually happened, given the lack of any survivors and that the whole structure of it makes it pretty clear it's a work of fiction-within-fiction.
The way I see OC is that it was meant to clarify some specifics about the how-dunnit for the gameboards, while also making the point that the how-dunnit isn't really what matters. Hence why it's said that reading OC will bring you to an understanding of two of the three layers of Beatrice's story, but the third is something you have to reach yourself.
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