I interpreted the comment as quantum ballistic conduction, similar to what has been observed in carbon nanotubes and some other systems. There's resistance, but it's effectively quantised (ie, there's an integer number of quantum 'channels'). It's independent of the length of the material, so it's non-Ohmic. Which in this case effectively means other than an initial resistance of basically getting current into the quantum channel, there's no further conductive loss.

FYI - Ballistic conduction is _not_ super conductivity, as the electrons haven't paired up to form Cooper pairs via a phonon lattice distortion, the current carriers are not bosons, and doesn't display most of the other characteristics of superconductivity (eg Meissner effect).

https://en.m.wikipedia.org/wiki/Ballistic_conduction https://en.m.wikipedia.org/wiki/Conductance_quantum