Yes, this would indicate two different devices that work together, but most rumors point to there being only one device. So it's hard to tell right now, which one it'll be.
System NX is well 2 consoles, a portable and a home console.
The portable will be close to Vita for the power. Will have its own games. Look like a smartphone with pad detachable...
The home console will be close to a ps4, but we will be able to also play with the games of the portable, home console will have a CPU x86 and a gpu amd, but also a ARM to ensure compatibility with the games portable.
Nintendo will replace the touch screen of the portable by the aiming system of Wiimote for the home console (intégred in pad detachable) .
Handheld device + pad detachable sold 149 dollars.
Home console + pad detachable sold 299 dollars
Bundle: home console + pad detachable + handheld device sold 399 dollars
The particularity will be a Community system of cloud using the home console to keep the online without month's subscription and to propose games massively multiplayer online (as well for the games portable as the games home console …)
So people could take only HC or only HH, or both together, but features between them going to do that à lots take bundle...
And if rumors speak about 1 console it's because Nintendo don't give all informations, studios are working on portable don't know anything about home console, studios are working on home console don't know there is a portable too