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I would be surprised if the lie was that steep. Here are the specs for Cobra single length irons. He may have been experimenting.
KING F9 ONE Length Irons | Cobra Golf
The KING® F9 SPEEDBACK™ ONE Length™ irons are engineered to simplify your game by reducing variables in your swing to increase accuracy and consistency.
I had created a rule of thumb where in coming back from a downhill breaking putt, I would assume half of the break coming back uphill. This is a common miss for me:
The observation had served me fairly well, but you present a nice analysis that indicates searching for the fall line is critical.
Looking forward to take an Aim Point class some day.