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My brother and I are contemplating the neck and fretboard on our first builds. We referred to Cumpiano, as usual, and realize that the use of dual action truss rods may render some of this information obsolete. Can any of you experienced builders confirm this?

Just before Cumpiano (the Big C, Coompie, you know) begins to radius his fretboard (page 283 of my copy) he tightens the truss rod to create a slight hump of 1/32-1/64" and then re-flattens the fingerboard. This step ensures that the neck will be under a slight truss tension when it is flat, so he can loosen a bit if he needs to create a forward bow. We think that this step is superfluous (extra points for using this word!) if we use a hotrod. Do you concur? Or is there a reason for this step that we haven't thought of?

Please send opinions before my brothers head explodes or turns inside out from overthink.

when using a 1 way truss rod ( they are fine to use) This step actually allows you to have a 2 way adjustment . By "teaking" the fret board , and then flattening it , you would allow front bow by releasing the truss rod.
With a 2 way , this step is not needed.

Thanks once again, John. It is wonderful to have a good understanding of the process, even though it's my first guitar.