It's probably fact but, like you, I have little RF or EMI in my home. I use Music Metre Silver which is unshielded, both, from my TT to the phono stage and then to the amp. There's even a tuner connected to the amp.
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I would say most line level interconnects in the vast majority of homes do not need any shielding.
The one area shielding is more important is in the Phono cable. since they end up with a lot of added gain by the time the signal gets to the amp.
One way to search for RF is to use a non contact A/C voltage detector.
On Amazon Greenlee GT16 is about $21.
You an search out stray votage with it. Wires, TVs, meters..
All emit stray RF...
The Greelee is better and easier to use than the other brands.. IMO anyway. (better adjustments, greater sensitivity, better response)
You will be suprised at some of the things emitting RFI..
And how it is possible to arrange things to not get hit by it..
If you don't believe it do what i did accidentally. I left a pair of interconnects hooked up to my preamp but nothing else. I was trying to track down what bad tube in my system was causing the static and found them, disconnected them and problem solved! That being said that is the only RF related issue I have experienced and I live in a downtown DC condo.