The clown in the back of my head thinks it must have been rather labour intensive, un-enamelling that wire. Just one of those quirks of language. I bet they cheated and never enamelled it in the first place.
There is footage of machines weaving braided outer for coax. Lots of spools of bare wire mounted on shafts mounted around a large ring. The big ring rotates and the groups of spools all rotate around each other. Sort of robotic highland dancing of the circular sort. Posher coax uses silver plated copper wire for the braid. Coax relies a lot on good contact between strands ar each overlay of groups of strands in the braid. Tarnishing from water ingress can push a TV downlead to over 1000dB loss (yes, a thousand dB, got by measuring a short piece and calculating the total)
David