[Mike O]

To quote "Clubface loft (2-C-1) and Hinge Action (2-D) determine altitude and backspin and are the basic elements of Ball Control."

Can someone explain to me why hinge action has any effect on the above parameters is loft is given. Isn't it redundant? Shouldn't it just be Clubface Loft determine.....

or

Is he saying that the hinge action creates a loft and it's just poorly written?

He's just noting that - not only is the delivered loft important at impact - but also the motion the face is making through impact will affect the actual loft at separation.