There's links to the source materials within the link provided, but beware: "LessWrong" is itself a cognitohazard a bit like Scientology is, with its own distorted vocabulary, belief that the entire rest of the world is ignorant of their enlightened truth, and all that other standard cult stuff.
A cult that is seriously based on a fucking Harry Potter fanfic, and is paid millions of dollars by billionaires because they like the cult's message. :so-true: :solidarity: :porky-happy:
Maybe so, to outside observation.
If the original wasn't destroyed in the process, there's still the fact that they're still there and a copy was made somewhere else. Unless there was some parlor trick done on purpose where outside observers were deliberately not allowed to know which one was the original, it's a shakey magical thinking premise to claim that the original, while still alive, somehow lost any ownership, even by way of external observation, of being what it already was.