The difference between Soylent and Ambronite is whether or not you have confidence that we can now (not someday in principle, but actually now) successfully reduce food to its most simple, fundamental components. Ambronite is premised on the view that consuming whole foods offers a better guarantee of nutritional completeness than the reductive approach that Soylent takes.
I can understand the logic of this argument, although I don’t understand nutritional science well enough to judge whether that level of epistemological conservativism is silly or just cautious.
One thing that completely ruins the credibility of the people behind Ambronite in my eyes is the fact that their ingredients are all organic and non-GMO. That is like a drug company that advertises that they produce absolutely no vaccines. Either they’re wrong about the relevant science or they’ll willing to pander to people who are, neither of which inspires confidence.
P.S. The comment about how Ambronite tastes healthy makes me realize there is such a thing as health theatre, analogous to security theatre. Health theatre means projecting a sense of health and wellness, which is nice and feels comforting, while actually doing nothing or very little for your physical health (your mental health is another thing!). Spas, for instance, tout the health benefits of all kinds of things — like rubbing orange peels on your face or whatever — but their real purpose is just to feel soothing and relaxing. So, health theatre might be completely benign in some cases like spas, where the unfounded health claims piggyback on real benefits for happiness and mental health.