You have clarity from the mothership
But just to be clear ( and perhaps redundant
), the "NT" is the bolt-on system that they employed in model-year 2000, which departs from their previously used bolt on neck in that the fingerboard extension is an integral part of the neck, and thus behaves as one solid piece when the neck angle changes. Compare this to the pre-NT where the fingerboard extension was still
fastened to the top of the guitar, so if one changed the neck angle, that fingerboard extension still followed the plane of the top. Everything except their Baby and BigBaby (IIRC) from 2000-present is NT system.
They used a fingerjoint to connect the headstock to the neck, which is the
same piece of of lumber and, when sawn from one piece into two, they stay together to be then joined ...this from the factory info and vids. This fingerjoint coincided with the NT. The scarf joint came in at model year 2007, along with the ES iteration 2 (aka ES1.2 where the AA batt system was replaced with a much better sounding preamp powered by 9v). The fingerjoint and scarf are functionally identical. Though as a personal opinion, few can argue that the scarf doesn't looks
far better than its predecessor, more like an intentional design than a functional furniture joint.
Just sayin
...and meandering on the keyboard with my cup o java with not much really to add. Be well and enjoy the weekend, all!!
Edward