Isn't "skin effect" the reason audio cabling in general has smaller and more numerous strands than the same gauge standard wire, less depth+more surface area=less inductance?J-Fkn-C... the input impedance into modern amps is 10k to 200k ohms.
(a 26 gauge would be overkill.)
“skin effect” would be a better argument for one gauge over another... and that would support a smaller wire as well.
but maybe he is right... (it would not be a she to make such a claim)
Wikipedia link for those that don't know what "skin effect" is.