Unfortunately, my "testing center" in my back yard consists of 80' tulip poplars whose top branches tend to snap pretty easily.
I can just imagine the DIY reports if some of started trying to make those. Lots of funerals and hospital visits...
The only problem with these is that the further up a tree trunk you go the more it moves. If you're tied to two trees 20m up and there's a bit of wind it'll be a bumpy ride. If for some reason the trees go from close to far then the hammock will go from loose to taut and you could get catapulted out of it, it'll be a fun ride until you hit the ground
The bat hammock on the other hand has a single attachment point. That would reduce your chances of having sway rip your hammock apart, but you also might find yourself spinning uncontrollably.
Still, it does look like something interesting to try.
I saw on one YouTube lecture that man is the only primate with a fear of heights.
I believe that idea is what Ed Speer claims got him started in hammock camping when he did his inside passage kayak trip northward along the Canadian coast. Big bears were a concern and along with hanging his food bag Ed decided to hang himself too. And somewhat high in the trees to if I recall correctly, using cliff climbing gear. I would have to go back and read through the book again to find the exact story.