Replace 'soylent' with 'junk food' in their marketing copy.
"Junk food is perfectly balanced and optimized for your body and lifestyle, meaning it automatically puts you at an optimal weight, makes you feel full, and improves your focus and cognition."
Yes actually. You can go to the store and buy high-fiber cookies with images of people doing Yoga on them. You can go to a McDonalds and read how their chicken burgers are low-fat and fit in a healthy diet and you can buy Red Bull whose commercials constantly claim it improves focus and cognition.
Not to mention all the 'regular' non-fast preprocessed food people all over the world believe to be fitting for a regular diet.