arXiv article says that code has been made available with the article, but I cannot find it
The &quot;Code&quot; tab is a relatively new addition to arXiv I believe, and may not have been there yet when the preprint was submitted. However, you can click on &quot;Other formats&quot; under &quot;Downloads&quot; in the menu on the right, and download the source. The package contains a .nb file, which I suppose is the notebook you are looking for.