I’ve been reading hifi forums for long enough to know that there is no hifi ditch worth dying in when you could be enjoying listening to music. I am sometimes mildly amused that religious discussions are banned on this forum but that discussions of cables etc. are, in principle, fine, when the latter can easily become just as divisive and dogmatic as the former.
But I digress:
A physical process which will happen in a stranded cable as it has an AC signal passed through it is that the individual strands will attract and not-attract each other with every AC cycle. If the cable has been left with stresses in it as a result of the manufacturing process, this cycling of attracting and not-attracting could reduce these stresses which, in turn, could change the electrical characteristics of the cable. This, in turn, could be audible.
Note to argumentative readers: I have very intentionally couched that explanation very conditionally. I have also not ventured a personal opinion on the matter. Bear that in mind before you waste your time and effort shouting at me.
Mark