My guess is that he is doing a judgment call on if the pass was "catchable" as the measure of his accuracy. Whether the catch happened then becomes a factor of the defensive playmakers and if the receiver can actually bring the ball in.
But, it will end up being a judgment call on if the pass was accurate. As long as he is putting every pass through a specific set of filters to determine it then the method is fine. However, my guess is that we will not get to see that method.
Still, like PFF, while we may not know what goes into the score, having someone else "chart" every play and put it against a scoring system has some value.
Cheers,
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Thad
The future is so bright; I gotta triple up! 
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