Cool, no worries. It's a good tool for Keeper League poolies, as they can kind of gauge how top-flight and long-term prospects are evolving within their respective team's depth chart.
The grades are fairly ambiguious, there is no statistical formula to how I grade them, but it just comes from my years of tracking these things and all these goalies. They get a little more refined every month as I learn more about organizational depth and how teams manage their goalies, and how goalie coaches influence that management.
It's not really geared towards fantasy slant -- but if it helps you guys out a bit -- awesome!