The chocolately-core link at the top of Make it Reusable with Ansible Roles - Ansible: Zero to Production Ready takes you to Chocolatey Software | Chocolatey Core Extensions 1.3.5.1 .
that page is supposed to be (or have) a nuget pkg but there is no indication how to get that package from the page.
Also, not exactly sure why this box makes me choose at least two courses.