"...an eutectic alloy of gallium, indium and tin, which neatly undercuts your claim that the only metal that is liquid at room temperature is mercury."
Probably, it meant "the only natural-occurring metal". It may not be fair comparison. I am not sure, but I think I recall that none of these three mentioned in alloy are liquid at room temperature when alone.
Concept of liquid cables is intriguing, to say the least. It makes regular people wonder "why would you"? I tried mentioning it and that was the response. More entertaining to me is that in forums that mention "snake oil" so often, someone brings up the product that has one of the descriptors as oil. Viscosity. I have never heard, and likely never will, liquid cables so I will give them benefit of the doubt that they are great. At the same time, as novelty and conversation piece, they are very clever and interesting. Five stars for that.