Again it's like the audiophile world - everyone has a different opinion; the article you linked says not to use plain water (which Bilt Hamber say is fine), but that car soap is fine - however from the Chemical Guys Clay Block link it says not to use car soapits been said to not use water as a clay lube
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Clay Bar Lube: Everything You’ve Wanted To Know & More
Do you need clay bar lubricant? What is clay bar lube? Found out those questions and more in our complete guide. A must-read for anyone clay barring a car.www.torquedetail.com

CAN YOU USE SOAP AS A LUBRICANT?
No! Lubricants are formulated to work with the clay bar and will not impact the integrity and cleaning ability of a clay bar. Shampoos and car wash soaps may damage the clay bar leading to deterioration, which in turn will limit its cleaning ability and shorten its lifespan. Specially formulated clay lubricants are formulated with uniquely engineered surface lubricants to allow for superior gliding of the clay bar and provide a slippery protective layer that clay bars can safely glide across.
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