I know there is the mute where you just reach down without crossing your skis, but on jiberish uncrossed mute involves crossing the skis so much that they go uncrossed, but point in the opposite direction. Pretty much tweaking the cross as far as your knees allow.
What is an uncrossed mute? I guess the grab in the video is just a really tweaked mute. Seems like a bit of a throwback grab because I saw a few in ski movie 2. Needs to make a resurgence because it's pretty damn cool. I've seen walllisch do them, but he doesn't do them quite as good as cosco.