For low level signal connections, it can be useful to have connectors plated with materials that either don't oxidize (gold) or have an oxide which is conductive (silver). For the same reason you can find gold or silver plating inside signal relays, switch contacts, RF connectors (SMA, BNC, etc).
Even for high level connections (speakers) this can be useful (Speakons are silver plated, and audiophiles love their gold plated bananas).
Speakons are of course the better option because you can't get the polarity wrong, and you can leave the speaker end of the cord disconnected on the floor without the two bananas shorting together and blowing up the amplifier (audiophiles consider protection circuits to be of bad taste).
The opposite end of the spectrum is encountered on old style loudspeakers and amps: a bare stranded copper wire stuck inside a hole and held with a spring contact. Unlike a proper wago, these contacts are terrible, and copper oxidizes readily, which means sometimes the contact is just bad. I don't mean "a slight veil in front of the speakers" bad, I mean scratching sounds in the speakers from intermittent contact kind of bad.
Now in your cable, about the material of the wires, there's been some debate, but so far I haven't seen anything that could be qualified as "scientific".
The insulator though, it really matters. If you wire a microphone on a stage and your cable sucks, then it will make a loud THUMP in the speakers every time someone steps on it. Some insulators generate charge when pressed or rubbed together (triboelectricity) and in addition to that, if there is DC bias like 48 V phantom power, then when the cable gets squeezed there is a change in its capacitance which also creates a signal. All these manifest as charge, in other words current, so they are most observable on low level signals from high impedance sources (i.e., some microphones). If the cable is driven at volt levels by an opamp with an output impedance of 50 ohms, good luck observing anything. If the cable is driven at millivolt levels by an instrument with an output impedance of 10 MΩ, then just rubbing a finger on it will probably generate an observable signal. This isn't just for audio, but for any kind of acquisition involving low levels and high impedance, like EEG/ECG. Special cables are manufactured for these applications: without these all the measurements would go YOLO every time the patient moves and the cable bends.
This only becomes audiophile bullshit if you take the second case (high impedance + mV) and apply it to the first case (low impedance + Volts).
Another thing about audio cables is that for cost reasons most home equipment uses unbalanced connections which are just terrible. There's always some current in the shield and it's also the ground which is the signal reference, so any voltage drop gets added to the signal, and "how it sounds" can thus depend on the resistance of the "shield" ground connection. It's much better to use balanced connections where the shield carries stray current but is not the voltage reference. Good quality balanced cables can be had at low prices.
