Phil
#1 Technically correct. Was simplified for people or he misspoke?
#2 Again correct. But as the "best" way to shoot would be if we could be TOTALLY "Inside" the bow, in between the riser and the string, thereby reducing stray vectors to zero. I'm sure that that is part of why Warbow shooters seek to shoot "inside the bow" as much as is practically possible. But there are practical limits to just how much "inside" you can be.
#3 The lever arm is the upper arm being pulled on by back tension? Look at the diagram and animation and visualize the upper arm as being like the connecting rod in a standard internal combustion gasoline engine, and the forearm is the piston. The shoulder joint is the crankshaft "throw" and we are manually cranking the engine around. View the "piston" as being near "Bottom Dead Center." Drawing the bow is like the "Intake Stroke" of a 4 stroke piston engine. I may be wrong, but that is how I see it.
#4 I wasn't clear on this one. Are your shoulder joints tri-planar joints? If so then I get your point. Get the shoulders at a right angle to the target. I myself shoot a closed stance, which comes from having started many years ago with a compound set for a draw length too long for me. Subsequent attempts later in life to shoot more open stance have not been good. But that's just me.
Now we can blather on about about this at great length. Probably have a good time and I may even accidentally learn stuff.
So all that aside, I do want to point out that I have found that shooting The Wedge is superior to the so called "Form Clock" that has been being pushed on another Traditional Archery site for many years. The Form Clock leaves the shooter stuck in the position that Archery Winchester referred to as a parallelogram. It promotes weak back tension, and extra, unwanted force vectors.