My thought is that his "problem" scenario is 24-gauge aluminum wire; which I don't think even the most diehard of "wire is wire" people have recommended.
His "solution" example is 10-gauge copper (and 12-gauge copper is a common recommendation).
I also think, nay, know: that the wiring guides we reference (such as Roger Russell's) take this into consideration when determining the recommended gauge.
But we knew when he said of dampning "'Dampness' has nothing to do with it.", that this would not be a scholarly article.
Also: he exaggerates his numbers (
http://www.cirris.com/testing/resistance/wire.html)