I’m not suggesting it was similar, only as an example of someone in the public eye falsifying (or so it seems) an aspect of their past, or concocting a narrative about themselves at odds with the public record, that they’ve recounted in various forms so often it’s possible they’ve come to believe it themselves.
I imagine the Walkers’ mental processes would be ‘Why we were homeless isn’t important — the walk itself, which we really did, is the real meat of the book.’ Tell the story with the fictional ‘Cooper’ often enough in interviews and you could probably pass a lie detector test.
Of course, there’s the same issue as with Jason Isaacs and skateboarding. Knowledgeable nerds get together via the power of the internet and share their doubts. It’s like being able to freezeframe films and tv and check out every little detail in a way you couldn’t in the past. Look how much stuff about the Walkers DOB, their adult children’s identities etc people found out and posted on Mn since yesterday.