Finally remembered I can get this working at work (when I'm not working). In hindsight, that sentence didn't work out so well...
Aaaany way, on slow-mo that is hard to read. I think what might be throwing people off is very, very minor, probably it's just that people were so used to the old roll and this new one looks different.
1) The body's center of gravity stays the same for quite long. The legs go up, the body bends down, but the hips don't go down until later. It's as if he jumped up in the beginning, as if to start a somersault, instead of rolling down. In the real world the person would anticipate the roll during the previous step, but you obviously can't do that in OG. Still, the downwards movement would have started earlier if that were possible, so I think the small delay in the beginning makes the character feel somewhat weightless.
Or I could be imagining things, obvs, since I've seen all of two instances of this roll in slow-mo!
2) The limbs move in a straight line from run to the rolling pose. Animation interpolation like this can cause problems like that.