I don't think they were implying the water heater wasn't done, and I do think they have a product.
"...safely test the heater. Once water heater manufacturers have been chosen, further field testing will be required involving the application in question be it residential water heating, pool heaters, RV water heaters, submarines etc..UL certification will eventually be sought for each application. So far, heat exchangers and plumbing are not dispaying any problem or leakage. "
I don't take this to mean the heater isn't done, just that it will require more field testing in regards to different applications, JMO.