You're welcome to include full sources, or not-tied-to-git directions to acquire them, with your release binaries. Regardless, whether or not you do that is a

You're welcome to include full sources, or not-tied-to-git directions to acquire them, with your release binaries. Regardless, whether or not you do that is a discussion of distribution format, not binary reproducibility. Your distribution can contain as much (or as little) additional material as you like along with your release binaries.