You're right: I am a D-Plane novice. I turned off quickly a few years back when a seminar speaker promoting it attempted to "prove" that Impact was really 'Outside-In' and not Inside-Out'.
This could be scary depending on angle of attack. If the ball is hit before low point, it will be inside out as you mention. However, if the ball is hit after low point then you will have Outside-in.
Depending on the context could be accurate or not.
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