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In the UK we call that a hair right. Or knotless hooking .it's designed to hook the carp in bottom lip nicer clean hook method looks after the fish. Barbless hooks too. I do a bit of fishing here in Northern Ireland. That's what I do on steemit and Dtube.

You are absolutely correct :) carp can suck the bait in from a few inches away and the food goes to the back of the carps throat where the teeth are - the teeth look like human molars - that's how they can eat hard baits like nuts and yabbies. With the bait directly on the hook, you can pull the bait back out of the mouth without getting a hook hold. These rigs are good for any fish that feeds this way - mainly those without teeth in their mouth.

I'd have gone fishing for ten years without thinking of that. So glad others before us have put in the hours :)