I am interested in these speakers but a little skeptical of their claims on website
Then why not buy a pair and take advantage of their 60 day trial period to reconcile your interest with your skepticism?
The nano stuff is just the cone doping they use. Lots of companies do it. Trenner & Friedl use balsamic oil. Zu uses some nano material.
As a Zu owner, I'd say I think about nanotech when I listen maybe once a millenium.