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Despite your intent your comment is kinda meanly worded, and it is perhaps you who did not read it, or at least mix up terms. In my parent comment I did not mention documentation, but tutorials, as in guide articles like devs not associated with a project writing about how to achieve some goal.
To be more specific, I think there are two distinct type of text that gets written about a project during in its lifecycle, in parallel:
#1 A documentation, written by the maintainers. This will always contain all functions, methods, API endpoints, components, whatever. It's the complete description to the full extent of features. It may or may not also contain the second type. An LLM can theoretically interpret and use the whole project based on this info.
#2 Guides, tutorials, reviews, forum posts, describing or giving tips on the whole project or specific features, or describing methods using that project ("Use x and y to process queries 20x faster on z!"). These writings were essential for the spreading and marketing of a mentioned project. I think this is what the OP article was about. My argument was that these would not be seeked anymore, devs would just ask LLMs "how to achieve x with this tool".