Come on that has to be a load of tosh.
I'd sooner buy a protected cable with a surge protector or something.
What I used to find was any kind of screened cable on an input, say cart or
microphone etc, could very easily go microphonic with age as the plastic
hardened inside, but mains leads? I mean, put a scope on the mains or even a
wireless intercom and listen to the crud on them these days.
Brian

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"Andrew" wrote in message
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https://www.hifichoice.com/content/atlas-cables-eos-dd

A snip for all those people on furlough

Andrew