How would an LLM answering questions about a git repo be legally different from a person answering those same questions (think stackoverflow)? Specific to this case, US law does not consider “APIs” to be copyrightable (Oracle v Google, Google reimplemented Java using the same APIs but their own implementation code, court ruled that Oracle couldn’t copyright the APIs).
Regarding “replace”, the primary use of the git repo is the code itself, not the Q&A about how to use it. The LLM doesn’t generate code that fully replaces that library or program, or if it does, it is distinct enough to be a different work.