I didn't interpret that to mean the WIRE was the cause. The WIRING was. I think the mention of Romex was intended to emphasize just how inept the wiring job was, based on the fact they used indoor rated NM wire outdoors, plus it was laying on the ground, spliced with wire nuts, covered in duct tape, etc etc.
However, it's not as if UF done the same way would have likely made a difference ...
A childhood neighbor (no longer a friend) moved up there years ago to grow pot, then got into meth and had a meth lab. He is in prison now, but when he was taken away a few years ago, I helped his sister put his stuff in storage (I think the storage facility burned in the fire now). Not only was his place a disaster waiting to happen, it seemed to me that almost every place we drove by was like that, anarchy in terms of construction standards, everyone doing their own thing. I'm surprised it didn't happen sooner. I drove from Huntsville Ala. into the hills of Tennessee once, that looked bad to me at the time, but this was worse. The people there were poor, but seemed to care. These people in Cobb Mountain were not poor, they were just totally out of it.