I'm with Evil Twin - nowhere near inverted and if you download the video and look at it frame by frame possibly nothing above 90 degrees anywhere.
Camera angles can lie.
As for "jack stall" - miles away from it. People banging on about "stress this and stress that" how much G do you think you can actually pull in a helicopter?
Looks like a B3 to me - it can probably lift its own weight on the hook - and then you make a 60 degree turn - 2G but not sustainable - 4 times it's empty weight - that would make a load of about 3.5 times what you see here.
The movie looks "interesting" in that it is unusual but not as extreme as made out to be.