What a freakin' rush that must be. I'm jealous of those that come after us... what marvels they'll be able to experience. I wonder if there will be enough loose nuts like us to try **** like that... I guess/hope so.
He's been doing this for a couple of years. There are a number of additional videos if you search for "Jet Man", and his own website is https://www.jet-man.com/
There was something similar done a few years back, but the guy used some type of webbing from his arms to his side to create a bat-like wing (with rocket on his back). If I remember correctly he was first dropped out of an airplane, then went into a powered glide through the mountains. Who knows, it might have been the same guy with the GenII prototype!
Looks fun, but if that poor guy ever lost power it doesn't look like that short wing wouldn't provide much of a glide, considering the weight involved. It would probably be time to deploy the chute!