Not too make a confusing subject more confusing, BUT..lol..you also have to consider where you are hitting from, the tip Venture was giving is not from a tee box, it was from the fairway where hitting to an elevated green, was also hitting uphill, where the club is by definition uphill, has more loft then from a level lie. Hitting from a level lie..Tee box..and the difference in elevation is not near as drastic.

Example..hitting a normal 8 iron uphill, in effect changes that 8 iron to a 9 iron distance. Take Greg's picture, and tilt it as if hitting uphill and you will see a much more drastic change in flight. Same for downhill. So you must factor in the lie as well, which will have a bigger effect then elevation.