The templates attached to the post are used in the first use case (Asset Group management) on the video.
Outbound API feature is very powerful and you can create a very complicated workflow. I intentionally keep these 2 templates simple so you can easily modify them and create your own template e.g. a single template for insert and delete.
So the template insert_qualys.json creates an asset group by IPv4 network creation event, delete_qualys.json template deletes the asset group.
Additional extensible attributes are not required.