And they still haven't added anyone with nutritional science credentials to their team: http://www.rosalabs.com/team/
If that's what you mean I think "so what?". Don't buy it. The marketing claims, like so many marketing claims, may be wrong. If the product does not help people then people will stop buying it or it will be like any number of other bogus "nutritional" products that survive on marketing and placebo effect alone.
Being skeptical of a product based on the team that created is valid, but doesn't mean the product isn't valuable. The product should stand on its own. I think that is the nature of a start-up, you create something get it into the hands of customers and experiment. Soylent just happens to use food ingredients instead of node.js.