Came here to post this. Motors and appliances heat up because of friction and because they are less-than-perfect conductors of electricity. Their good heat conductivity is why they don't get even hotter.

There's more:

"The electrons were moving in unison with each other, much like a fluid, instead of as individual particles like in normal metals,"

Which describes a superconductor, but that word never appears in the writeup.

Subject is interesting but this article is clearly written by someone not very familiar with the science.