The links drawn between the books are “weaker than weak” (to quote Little Richard). This is akin to just thumbing the a book and saying, “oh, look, they used the word fracture and this other book used the word crumble, let’s assign a theme.” It’s a cool idea, but fails in the execution.

Yes. It's flavor-of-the-month Anthropic marketing drivel: tenuous word associations edition¹.

¹ Oh, that's just LLMs in general? Cool!