I see it now.. that's MeyerTech use of the Button Knot.. I use them all over my kit.
On my hammock, I keep traditional CLs, but have the button knots on the ends of all of my various suspension components to accomplish the same thing Jeff shows. However, I find it easier to keep just plain CLs on the hammock in the event I choose to use something with hardware.. IE traditional whoopies with a whoopie hook or an SLS with a Double Whoopie Hook..

So many ways to skin the cat...