No, it doesn’t, nor do we. It’s why abstractions and documentations exist.

If you know what a function achieves, and you trust it to do that, you don’t need to see/hold its exact implementation in your head.

But documentation doesn't include styling or preferred pattern, which is why I think a lot people complain that the LLM will just produce garbage. Also documentation is not guaranteed to be correct or up to date. To be able to produce the best code based on what you are hoping for, I do think having the actual code is necessary unless styling/design patterns are not important, then yes documentation will be suffice, provided they are accurate and up to date.