Greg:
I didn't lookup the item, and thank you for doing that and posting it here. I never saw that type of nipple/connector.
I did hear the video say 2 close nipples, and thought about 'why' briefly. Yes, it does not create a death threat being unsupported by screws/anchors, but I would have a discussion with the EC/installer about 'why'.
Stay safe and have a good day.
