It looks like a bowline but he's finished it off with a slip loop so it can be collapsed quickly. Maybe useful for whatever purpose it's being used for but that type of modification makes any knot potentially unstable.
That's what I thought at first, but if I pull it through, now it looks like this.
I think it is a truckers knot. Many years ago the people that made molding would tie bundles with that knot.
It's a quick release bowline.
It's a bowline where you only pull a loop through instead of the entire tail.