Take an API for searching products, one for getting product details, and then an API for deleting a product.
The documentation does not need to cover the detailed scenario of "How to delete a product" where the first step is to search, the second step is to get the details (get the ID), and the third step is to delete.
The LLM is capable of answering the question "how to delete the product 'product name'".
To some degree, many of the questions on SO were beyond basic, but still possible for a human to answer if only they read documentation. LLMs just happen to be capable of reading A LOT of documentation a LOT faster, and then coming up with an answer A LOT faster.