OK, this, to me, says it all. Penac, or their distributors, have basically taken something which is beneficial when used as intended, and put a marketing spin on it, to appeal to those who will be appealed by it. Is clay beneficial in the substrate as an additive? Of course!
If we had the marketing skills, knowledge, and financial wherewithal to do it, we could all do similar things with ridiculous claims, and someone would find them irresistable. Let's see, I'll get some kitty litter, soak it in some of my healthy tank water, then market it. It could be 'power clay with aquatically aligned water molecules from a healthy tank to remind the water of the new tank how to be healthy'.