Hi there – so that post is about a tool that was developed for HSDS 2.0, which has since been deprecated. We can still access that page on a previous instance of the documentation, so i have updated a link, but also added an editor’s note to indicate that the tool is not currently in use or being supported.
It would be great to explore opportunities to develop a new transformer for the current version of the spec! It’s a big undertaking though.