He may be talking about the underrated Swastika Nights. A new world, after memory of the old one has been erased is part of the plot, as is a secret manuscript.

That said, stories and plots have been retold ever since the beginning of literature. Here's a lovely article about various versions of the well-known story about the Baalshem being asked to intercede for a sick child: https://brill.com/view/journals/jjtp/22/2/article-p127_2.xml

Yevgeny Zamyatin's We. (1921) https://en.wikipedia.org/wiki/We_(novel)

Also Jack London's "The Iron Heel": https://en.wikipedia.org/wiki/The_Iron_Heel

Taking inspiration isn't plagiarism

books of the same genre share motifs and themes

H.G.Wells - The Sleeper Awakens https://en.wikipedia.org/wiki/The_Sleeper_Awakes