There is a world of difference between "unsafe" and "unhealthy." I am not claiming that frozen dinners are healthy. Far from it - I avoid them like the plague. However, they are not going to land you in the hospital in the short term.
> think that there may be some merit to the Soylent team and their claims
The fundamental issue is that statements like "there may be some merit" might be sufficient for trying an iPhone app. It is NOT sufficient for trying a radically new diet like this one.