After clicking the initial Go to Material link, the user is sent to the Summary Page that provides overall details, instructor resouces, students resources, and partner resources. The downloadable pdf is not apparent initially. Students would perhaps need to be directed to the pdf.
The supplement is completely text based, so there is no interactivity and if the student needs extra assistance or wants to delve deeper, there are no links to go to. Videos and dynamic activities, or at least links to them, would help.