The NACS is not part of CCS.
The plug type is not part of CCS either.
And what you called „Type 3“ is in fact a completely different plug that uses this name as standard.
Perhaps this might help explain why you both are saying similar things in different ways and maybe just talking past each other:
CCS doesn't exist as a standards body in and of itself. It's a joint effort by the North American SAE (Society of Automotive Engineers) and the European-based IEC (International Electrotechnical Commission). The CCS standard is actually sets of interoperable standards defined by both the SAE and the IEC built to work in tandem. There is no actual "CCS standards document" there are only SAE standards and IEC standards, but if the joint CCS work does its job they interlock to form one worldwide mega-standard which we call CCS because it useful to name the combined Voltron form.
The NACS plug is in the final drafting process of becoming a recognized SAE standard. In that SAE standards (help) define the CCS standard, NACS is being standardized as a part of CCS, or at least the part that SAE controls/owns. Whether or not you can name it "CCS" depends on what you think the name CCS stands for. SAE and IEC always had different plug standards, so in that regard NACS isn't new to CCS and is a normal part of CCS because whatever SAE says is the North American standard plug is the CCS plug in North America. On the flipside with naming, is branding and NACS clearly has its own brand name and development history. It was developed for Tesla initially. It was opened under the brand name "NACS" to help sell it to the rest of manufacturing. "North American Charging Standard" was an intentional PR move. Because it wasn't intentionally developed for being called "CCS" and because it has a strong brand name of its own, does that mean you can't call it "CCS"? (A rose by any other name, right?)
When that standard is finalized it will be the third type of plug that has a practical rollout. Does that make it the real "Type 3" as opposed to the older prototype that didn't make it past standards processes? Do we want that to call it "CCS Type 3" in the long run to reduce confusion? If "CCS Type 1" is truly dead, but is also the standardized name for "Plug that North America uses and is SAE standardized" should we refer to it as "CCS Type 1 2.0" or something like that?
Names are one of the hardest problems to solve. But to recap the facts: NACS will be as close to a part of the CCS standard as it gets (because it will be an SAE standard), and is a new type of plug now directly related to the CCS standard. Whether you want to call NACS a part of CCS is a matter of perspective and branding as much as "standards" on the ground.
But they'll still be using CCS, as you yourself admit.
Tesla's protocol is dead.