You are partially correct but you've missed some very valuable and important information.
For clarification, the Shaft and Clubface rotate around the same center, meaning, the Hinge Pin. HK, the "Shaft" isn't rotating around it's longitudinal center, but rather that it is moving on-plane around the Hinge Pin. The Clubface is also rotating around the Hinge Pin and not around the Longitudinal Center of the shaft. So, the Clubface is not rotating "normal to the path" when using any of the 3 Hinge Actions.
For additional clarification, there is another way to look at Hinge Action compared to the "Normal to the Path" rotation of the Clubface. In "Normal to the Path" rotation, the Clubface stays aligned to the Clubhead Orbit. This causes a corresponding Clubshaft Rotation around the Longitudinal Center of Gravity of the Golfclub. Hinging changes that. For Horizontal Hinging, the Longitudinal COG and Shaft, at Impact, are vertical, one above the other, due to the Mandatory Flat Left Wrist. They Both Rotate, together around the Hinge Pin but maintain their Vertical relationship to the Horizontal Plane (the associated Plane). This is very different than the Shaft continuing to rotate around the COG of the Golfclub as it would in a "Normal to the Face/Path" which is "Swiveling through Impact". In Angled Hinging, we have the same geometry except that the Hinge Pin is angled and the Longitudinal Center of Gravity of the Golfclub and Shaft maintain their relationship to the Angled Plane (Associated Angled Plane).
Trackman identifies "Spin Loft". This is probably very good to identify whenever you don't use Hinging. When not using Hinging, the Ball will roll on the clubface. TGM has such cases, for example, the Lob Shot, etc. For anyone using Hinging, Clubface Loft is considered at separation. TGM states that Vertical Line of Flight is a resultant force, and is a line bisecting the Line of Compression and the Rebound Direction. The Rebound Direction is 90 degrees to the line of compression (Angle of Approach, Angle of Attack). When striking a golf ball, if you lose the line of compression before separation, then you introduce scattered force vectors and it will result in scattered rebound vectors which will result in scattered resultant Force Vectors. That would be a Mis-Hit, poor execution unless done intentionally, and that will change the Vertical Line of Flight, Loft.
TGM considers "Smash Factor". It is not the quality of compression but how much of the ball was compressed. See Below: Also note that each line receives maximum compression.
When considering Layback, the Clubface is Laying Back relative to the Hinge. This is different than the "Normal to the Path" clubface layback that Trackman calculates because the Clubface is also closing about the Hinge Pin. In Angled Hinging, Layback does not necessarily lose compression because the Impact and separation points remain the same, but it will compress less of the ball by about 1/10,000 of an inch. Rather, Layback tilts the balls spin Axis.
Sorry, I don't know how to do multi-quotes. BUT, I never used the term "normal to the path". I don't even know what that means.
I'm very comfortable with my understanding of how the impact collision between ball and clubface create Initial Launch Conditions and the resulting ball flight, which comes not only from TrackMan, but from the many scientists who have researched this. I doubt that the book can add anything to the knowledge of the distinguished scientists who are the present-day experts in this field. I am simply just trying to understand what Kelley meant when he wrote the things he did.
Here's some measurable conditions of the impact collision which nobody is exempted from and some traditional golf instruction terms to describe them.....During the collision, the clubhead is moving. The direction of this movement at separation has a vertical direction, relative to the ground, called the Angle of Attack, and a horizontal direction along the ground, relative to the Target Line, called Clubhead Path. The "normal" (dictionary term) to the clubface at separation also has a vertical direction, relative to the Attack Angle, called Spinloft, and a horizontal direction, relative to the Target Line, called Clubface Angle. This is the language that I speak. Is is possible that someone could describe, in my "native" tongue, what Kelley is describing in 2-C-1?
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