I remember being an electronics store once and seeing some cables intended for audio that described themselves as being "low oxygen" cables. My god, the nonsense that people fall for!
Out of all the ridiculous things, this one is actually not completely ridiculous. For low temperature physics applications, Oxygen-Free High Conductivity (OFHC) Copper is the only material that is sufficiently thermally conductive at low temperatures. I’m not an audio person, but I have a hard time imagining it would make much of a difference at room temperature; maybe similar performance with a slightly thinner cable?
My walk in freezer sounds amazing though
Avoiding corrosion may be another benefit, although I'm not sure how much effect it has in practice compared to regular non-oxygen-free copper.
Finely stranded, tinned copper marine wire would be the ideal for corrosion resistance.