Correct, with a clarification for all readers. You can use the wire nut to continue twisting the wires until the insulated portions are also twisted to presumably arrive at the same end result. The advantage of pre-twisting using pliers is that you can clip the wires to the appropriate length, visual QC, and even lightly test the strength of the connection before applying the wire nut.
I agree completely, a pre-twisted splice is superior to just holding the stripped conductors with one hand and spinning on the wirenut. Some will disagree but that’s okay. 
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Finally, something I can use my old safety wire pliers on. 
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Nice!
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I use to use them all the time during my aircrafting days.
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Yeah, I’ve used them helping my father and brother-in-law build and repair and do maintenance on various airlpianes and helicopters but didn’t remember what they were called.
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I believe it is right on the breaker itself. Can’t be sure on those because they don’t look new. Maybe it is just the picture or tired eyes.
There are times I am sorry I gave mine away to an apprentice I had trained now working for JAAR’s in Papua New Guinea
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Jungle Aviation and Radio Service 
This was a specific skill I once had a mastery over. Thirty five years later, I am curious how quickly it would come back to me.
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You had to have the knack to be able to safety wire the right way in a consitant manner, a knack I never really had, but I got by.
One thing I always wished the airplane MFGs would have used more of was safety cable. GEAE used it and probably still does in many applications. It’s much easier to install and you get perfect results everytime.
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