Paulsax - That's mechanics of dielectric absorption. You'll find it here: http://www.sencore.com/uploads/files/UnderstandDielectricAbsorption.pdf
Is it significant? I have no idea since I don't use Audioquest but some their cables like "Sky" are very, very good. Reviewers mentioned some difference with DBS ON vs OFF but it could be placebo effect as well. I don't know enough to question Audioquest. Acoustic Zen Absolute (foam Teflon in oversized tubes), that I use, is as good as SKY but without DBS.