This is the term in
psychology that means the feeling of having previously
experienced an event or place actually being encountered for
the first time. It is the same as the French phrase déjà vu which can be translated as "seen before".
In parapsychology the same term is used similarly to precognition, which means knowing something and being able to describe it before you encounter it.
Because of the similarities between this film and that book,
everything felt oddly like promnesia, except
the book was
science fiction, and this movie was non fiction.