Probably like the wide tarps with internal spreaders. You have prusiks on the internal ridgeline and clips that go from the prusik to the pole.
edit: I'm wrong, looks like he is using just prusiks and running the pole through it. In his video for the regular wide, he mentions using a double biner attached to the prusik. Look at the link he provides to the website and there is an image showing how the prusik is used.
https://www.youtube.com/watch?v=wINGedOH3qc
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