No, and this is a complex enough subject so it probably makes sense to discuss:

Everything kills you. Oxygen, water, sugar, protein. You have about a billion heartbeats before your heart gets too tired. The goal is to find the right balance of things you eat, do, don't do, etc so that you maximize your useful lifespan. I am sure that Soylent kills you faster than a balanced diet, because (a) it's processed (b) not diverse enough and (c) uses subpar ingredients. It is the whole meal equivalent of hot dogs: techincially has fats, proteins, carbs, micronutrients, but eat enough of them and you will suffer.

Besides, Soylent is not a new idea. Take a look at Ensure shakes. Would you drink those for the rest of your life? If not, then why drink basically the same type of stuff but with a different label? Because a software developer is selling it?

Edit: another idea for a convenient complete meal: McDonalds. Protein (burger), fats (fries), and carbs (soda). Blend it and you have Soylent 2.0.