This is LLM territory and they are extremely good at it.
An LLM may be able to synthesise results well each time, but there will be quite a difference between a synopsis written by an LLM and someone whose job it is to write synopses of books.
Huge difference in quality, and considering the clientele, they are willing to pay for that quality.
Being an LLM that "knows a bit of everything" doesn't necessarily give you access to know the audience expectations in this sort of environment. They are layers of fashion and social context which almost intrinsically embodied as a fringe of temporal currency and connection, not necessarily available in any training corpus.
An LLM could be stuck in some imposter/savant moat here, always making last year's references or possibly over or under selling the current expectation.