First, Lee's mistaken in terms of how bounce works. The clubhead doesn't "bounce" into the ball while the ball is on the clubface. But he's right in that you don't want to severely de-loft the clubface to get a lot of backspin. You want a difference between angle of attack and dynamic club loft to create a high "spin loft."
As to the dynamics of impact with higher lofted clubs, here's what happens.
The ball slides up the clubface but it's a relative thing - the clubhead is going down. The ball is only ever going upwards and forwards - it's never going "down" unless you top it. The clubface - the dynamic loft - is still "more important" than the path of the club (downward), so the ball never goes down. As the clubface goes down and forward, the ball is going up and forward. The grooves on higher lofted clubs help to grab the ball and you effectively generate a system like two gears - the back of the ball meshes with the "gears" on the clubface, and both go "down." This creates backspin.
Maximum backspin is caused when the ball grips the clubface the most, when the ball is halfway through the impact interval and at max compression. The CG of the ball projected onto the clubface will often be a groove or so higher than the initial impact point, again because not only is the ball moving upwards, but the clubhead is moving downwards.
So yes, the ball moves up the clubface during impact, but I don't know that I'd call it "rolling" up the clubface per se. If you had a ball that didn't "compress" at all, you'd get virtually no spin on the ball at all. That compression is why urethane balls (softer cover) spin more around the greens than surlyn balls - the softer outer cover is all that can "compress" against the clubface on short shots without a lot of clubhead speed.