This is endemic to many CERN projects, even things that are often open source are behind a login. Or - the source (or export of it from CERN's GitLab) will be available, but documentation is behind a login page.
This is especially frustrating if you want to learn more about the issue, or you'd like to contribute to the project.
https://github.com/search?q=org%3Amozilla+docs.google.com&ty...