That’s fundamentally false. A coax cable with a single center conductor can absolutely be used for phono applications. It is properly shielded. Unlike Anticables.
All of the most sensitive instrumentation equipment on Earth at research labs use coax cable. Where even the smallest amount of noise can be a huge issue.
All of the most sensitive instrumentation equipment on Earth at research labs use coax cable. Where even the smallest amount of noise can be a huge issue.

