I consider all this verbiage to be "advertising puff" that's been around forever.
Here are Shunyata's claims:
https://shunyata.com/power-cable-tech/
Is there anything fraudulent here?
Shunyata is pretty careful not to make concrete claims, but they goofed up in the paragraph about "CopperConn:"
Many audiophile grade connectors are made from brass or bronze. While some may get a plating of silver, gold or rhodium, the majority of the current is carried by the contact’s base-metal. CopperCONN® connectors contain pure copper contacts which has a much higher conductivity that brass. The difference in performance is clearly audible.The difference in performance is clearly audible.
This is definitely BS.
Or possibly they found the worst bronze connector and compared it to their copper one, and got a 0.1dB difference, which is technically considered audible. At most. Highly doubtful though. And not what most people consider "clearly audible".
Also, they IMPLY (but don't actually say) their power cables reduce audible noise by 12dB. They don't, obviously. In court they could correctly claim that they didn't specify at what frequency... it's probably -12dB at 150khz or something... so I would call that a lie in all but the most legalistic sense.
Here's another one.
PSAudio is likewise careful not to claim much about the cables' actual performance, but here they couldn't help themselves:
The use of FEP Air-Tube insulation, with almost nothing but air around the solid conductors, improves the sound of an audio system's focus and dynamics.
Yeah effing right. PROVE IT. They can't, and they won't, because it doesn't.
Also, the fact that these cable manufacturers HEAVILY IMPLY that the cables improve the sound, but RARELY ACTUALLY SAY IT proves the point pretty well. They don't want to get sued, their marketers don't want to gain a reputation as outright criminals (scumbags, maybe) so they toe the line but don't cross it.
If the cables actually did what they (don't) say they do, they would just say it. The fact that they
very carefully avoid ACTUALLY saying what they say the cables do, proves that they know exactly how dishonest they are.
Example:
Asymmetrical Double-Balanced Geometry offers a relatively lower impedance on the ground for a richer, and more dynamic experience.
They say "experience", not "sound". Odd, I thought these were audio cables? Are they piping some other kind of sensory information that I can experience?
High-end audiophile cable manufacturers that are stupid or drink their own kool-aid, lie outright. The rest lie in ways that are extremely dishonest, but technically legally permissible. They all lie.
Here's a pretty honest one, but it's still exploiting people in a very unethical way. They just state how ethernet cables work, and let the viewer assume they're saying things that are relevant to sound quality, since it's billed as being for audiophiles. Of course, it does nothing at all for sound quality, but hey, don't let that stop you from spending >$200/m on a cable that ought to cost $4.
I would argue that most of this language and framing goes beyond puffery, and many or most of them would lose a class action. Unfortunately that's the only worthwhile type of lawsuit against a firm like this, and their customers actually get angry if you tell them they've been fooled, so I guess the chain of deception will remain unbroken.