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[RuudNL]

Funny that people (think to) hear a difference between different cables. When I was still working for a radio station, we had two kinds of cable from the same manufacturer. One kind was black, the other kind gray. A colleague claimed that the gray cable sounded 'better' and even hid cables when he had to make an important recording the next day.
My idea: he had once made a good recording and used gray cables. From that moment on, he was convinced that the success was due to the gray cables...

[klaus]

I cannot comment on the specific case you cite, but do not underestimate the role a dye in the cable jacket can make in affecting the electrical properties of a cable.

[RuudNL]

What could be an explanation that the outer jacket of the cable could affect the audio quality?
The outer jacket lies outside the shielding layer, so no effect could be expected from this.
(This reminds me a bit of people buying an expensive cable between their CD player and the amplifier; low output impedance, high input impedance, resistance and capacitance of the cable are negligible. And yet people who buy a $100+ cable, now called an 'interlink', -sounds more impressive-, say: "it sounds better now". I suppose they want to hear the money that is no longer in their wallet...)

[klaus]

Jackets measurably affect capacitance, reactance and likely other, less obvious electrical parameters of an audio-carrying cable.

Without getting into the philosophy of perception vs. delusion, I can cite conversations with a major cable manufacturer who, after realizing the new jacket material was no longer amenable to the sound envisioned, reversed the jacket material to the previous design, dimension (and dying) and all was well again.