Opinions on this "white paper"

Their theory that electrical resonance can be a problem with electrostatics has merit. However, there is no proof that it is a significant problem or if so, is audible. They do not show how this resonance can result in "brightness". In general, the things that they say such as: "So it is vitally important that the cables have low inductance" are true for all speakers, including electrostatics. They also say "Many cable manufacturers deliberately add a lot of capacitance to their cables.". This is simply not true. It is an artifact of designs that make the inductance very low, which is the primary goal.

Twl has it exactly right, although maybe the way he said it confused some people. The lack of a scientific measurement which correlates exactly with some particular "thing" that you can hear, does not mean that the "thing" does not exist. All it means is that science hasn't figured out how to measure it yet. The whole world is this way, not just audio, and so it always surprises me that people expect scientific perfection out of audio when, for example, medicine is still in the dark ages (in relative terms, at least).

So is InnerSound's coaxial speaker cable design worth trying? Are they best suited for electrostatics?
From what TWL is saying, there are things which may affect the sound (and aren't measured) more that the measured inductance and capacitance that InnerSound used in designing their cable.
Is it worth adding this co-axial speaker cable design to my list of DIY cable projects?

Karls, your post seems to agree more with Zaikesman than with Twl. If that's the case I agree with you.

The measurements have been made - i have made them. The real challenge is to correlate these to audible affects. This has not been done by anyone ... yet.

Interconnect cables have different phase shifts, different dielectric absorption, different capacitance.