Thin and really thin cores should be avoided regardless of how exotic the metal material is claimed as the lack of metal in the core conductor will increase resistance.
As good of a speaker designer as Shaw may be, the above is an example of how wrong he can be on closely related topics. Much like his earlier claims of being agnostic about amplifiers, Shaw is wrong in his over-emphasis of metal content.
I have been using Audience cables, which are well-known for being quite thin, on and off for many years. I also used them with Harbeth 30.1 speakers, and compared them to at least two other well-regarded brands that happen to have higher metal content. The Audience won, and I still use them now within my current system.
I’m not trying to push Audience, but there are reasons why they have been highly-regarded for decades now, and why their resale values are strong, etc.
Take a look at the reviews of Silversmith Fidelium cables as well. I’ve never heard them, but many apparently swear by them, and their metal content is obviously very low.
Don’t be fooled by Shaw’s poorly informed opinion.