I'm skeptical. Not that I think they're getting bad information, but that I think they're missing parts of the story and are incorrectly interpreting things.
For instance, why have a handheld that you have to attack extra parts onto? I'll speculate an alternative explanation - the controller can be split into two parts, and either used separately like Wiimotes/Nunchuks, or together as a regular controller. Then, the handheld can be inserted between the two parts to imitate the Wii U's tablet.
Similarly, I could see the "base unit", the "dock station", having its own internals, perhaps comparable in power to the Wii U, and then the handhelds supplementing the power.
The alternative would require one of two things - either NX being inferior to the Wii U in terms of power/graphics, in which case many people probably wouldn't "upgrade", or NX being superior to the Wii U as a handheld, and thus being far too expensive and power-hungry for a handheld.
And in the same way, I bet that "Nintendo recommends a 32 GB cartridge" is actually "Nintendo anticipates that most games will end up using 32 GB cartridges" - many of the lighter games would still be under 8 GB.