Soy as a whole product, contains many things, one is lecithin. Soy lecithin supplements simply rip away the lecithin, which does not contain any of the other good/bad things of the soy (except of the inevitably trace amount due to the mechanical extraction process).
Do you know what lecithin is? It is a mixture of glycolipids, triglycerides, and phospholipids. It can be isolated from eggs or soy, but egg lecithin is not the same as eggs, as soy lecithin is not the same as soy.
Before making this claims do some research. In spite of current research against many soy toxins it is important for people to know that soy lecithin is not to be fear.