Yup, it's the same one. I really like how he reviews and gives you tips on vaping stuff. There's this one forum I'm a member of where they don't allow links to videos and I wasn't sure the same applied here, sorry.
Back to topic: I've never had any backflow with the VVN, not even when I vape it upside down (which I do when reading in bed).
Here's another tutorial on rebuilding them from ninja vapes, with some warnings: Ninja Vapes: The Vivi Nova Story Part II- Rebuilding In-Depth
