No, I've never seen that carry. I will give it a go. I carry it on my shoulder sometimes but its..., well, it doesn't look like that! I don't think that hold will work when I have a milk crate of groceries on the back, but it looks more stable and out of the way than my current attempts.
I saw this in my research on how to lug a bike around. Does anyone have experience with a device like it? I may try to rig a DIY version.