Cusco,
that accident vid seems to show the guy's own misjudged time/space clearance for pulling the chute. Sure, it's related to wingsuit as they've got the chute until they perfect the right flare procedure for landing
The guy got away fairly OK, considering the nature of the terrain. He could have resembled human snowball.
I've seen the first linked video while ago. Sounds like next step from simply jumping off 200-400ft high span/bridge/tower/cliff and pulling the chute straight away. Hmm. But then, this looks like the closest thing to human flight (or should we call it controlled fall?) I'd go for skydiving should I get bored of staying 'afloat' in gliders or powered aircraft.
Still far from thermalling in 'own clothes'..