It looks like you can adjust the clearance by moving the mount, which seems useful. I wonder how much the belt might move while riding (relative to the swingarm).
Protecting the inner track is interesting, for sure. I casually browsed some belt guard designs and didn't find much like that, except for chain guides. So it's like a chain guide but hopefully scattering rocks and other things. Maybe a variation would be to have the forward edge angled to sweep debris away from the tire/bike. I mean, I'm not confident about the dynamics, just wondering if a little tweak matters.