As I mentioned, both of the other cables mentioned by the OP are shielded.
In addition to what Erik said, I'll add that I don't trust this guy much. I'd double check everything he says, especially whether a ground wire is required. His graphics call 2 12awg wires 6 awg which is wrong (they are about 9 awg) so he lacks some understanding. I didn't watch the rest of the video to see if he got other things wrong.
Jerry