Oddly enough, this is basically a subplot in The Magicians.
For anything in the Harry Potter ’verse to make sense, we have to assume that some (most!) Muggle fantasy is a distorted account of the actual magical realm. Otherwise we’re in Discworld territory, with the causality flowing in the other direction.
In the case of Narnia, the Christian allegory probably was the distortion. The Last Battle would have to have been completely made up, anyway.
That’s a pretty big change too then! How did Lewis learn of Peter Pevensie, and how did he ever manage to turn his story into a Christian allegory?
Oddly enough, this is basically a subplot in The Magicians.
For anything in the Harry Potter ’verse to make sense, we have to assume that some (most!) Muggle fantasy is a distorted account of the actual magical realm. Otherwise we’re in Discworld territory, with the causality flowing in the other direction.
In the case of Narnia, the Christian allegory probably was the distortion. The Last Battle would have to have been completely made up, anyway.
Maybe what’s available of the true account was recorded by Susan. She stopped believing in Aslan after she became a Christian.
Ironic!
Alternatively, the true account could be what appeared in Omake 3, where Susan presumably never believes in Aslan.
Either way, Lewis becomes a pretty unscrupulous liar. As I’m rather fond of him, I don’t like this conclusion, but it’s EY’s fiction.
Does one account or another have to be distorted? Alternate universes are pretty common in fanfic.