I get that you don't like this product, but why do you have to lie? There's no soy in it.
I can see that there might be soy from the processing plant, but I can't find that information easily on their site.
Soy or soybeans are not an ingredient in Soylent. It has the "Contains: Soy" allergen label because it contains a small amount of soy lecithin, which is derived from soybean oil. Soylent contains lots of oils/fats, and you mix it with water to drink it. Oil and water don't normally mix well. Soy lecithin is an emulsifier that lets them mix without clumping.
My wife is into clean eating. So we limit soy as part of this trend. However, I'm really lazy about eating (1 meal a day when left alone). So Soylent looked promising in that regard.