Absolutely. The origins of multiple insulated conductors comes from Litz wire, where the strands are insulated. But Litz requires a special stranding, where each conductor spends an equal proportion of its length at each depth. This minimises skin effect, and is in common use in RF systems. Simple insulated stranding is not Litz, and will not reduce skin effect. The rest of the explanation is a mishmash of a lot of other woo pedalled over the years. There simply are no such effects.Can I assume from this review that individual strands vs conventional shielding have no effect and it's another snake-oil marketing gimmick?
Skin effect gets trotted out every now and again, and it is real, but not at any audio frequency. The calculations are not hard.