The website is a beautifully crafted piece of advertising. Nothing wrong with that of course, but it's in the same league as a glossy brochure for any new product. Heavy on promises, light on evidence.
TBO 3000 hours is interesting. If it actually achieves that, it could become very popular. Vibration and fatigue-related issues prevent that kind of TBO with other diesel engines - particularly Diamond's otherwise very good engine. This leads me to the question: what do they know, that Diamond don't? Perhaps something, perhaps nothing...