This gets down to the technical difference between a bend and a hitch. A bend joins two different pieces of cordage. A hitch attaches a length of cordage to an object such as a post, a rail, or a ring. Here's where the waters get muddied. Is the CL considered another piece of cordage or is it looked on as a flexible "object?" If one were to tie a Bowline at the end of a line and then secure a second line in a Sheet Bend manner, should the result be called a bend or a hitch? I know thinking about it won't keep me awake at night!
I didn't view the vid based on the various comments about not being able to really see anything. If indeed it "looks" like a Single-slipped Reef Knot and one takes the view that the CL is a ring, then I guess you could call it a Slipped Girth Hitch, AKA Lark's Head, just not collapsed.
FWIW, a Reef Knot is a very weak means of joining two ropes. Not recommended where any significant pull is anticipated. But that Double-slippery Reef Knot will work just fine (most of the time) on your shoelaces. And, btw, where a Sheet Bend REALLY shines is when you are joining significantly different sized pieces of cordage.
(I blame/thank Boy Scouts for turning me into a bit of a knot guy!)
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