That smooth twist reminds me of paradox barrel, although rifling is pressed from outside the barrel, and apparently there's no such thing as rifling in precise meaning of term.
Nevertheless that barrel causes some sort of spinning in the same sense as paradox barrel did, although not pressing grooves but only shadows of grooves to pellet.
Well, I'm not big fan of that new barrel type, but let's see what it could do... I could very well give it a chance still, although I don't buy the theory behind it. I like to have a barrel with twist (be it ordinary or polygonal) or no twist at all (be it smoothbore then).
But, whatever works... it works.