Did you even read the MSDS? It isn't mentioned anywhere.
The purpose of the soap is to wet the surface of the leaf so the herbicide won't run off after being sprayed.
The tallow amine fatty acids are widely used in thousands of products besides Round Up. Including low irritation baby shampoo, liquid detergents etc etc. They are not considered hazardous except when fish or amphibians are exposed because they adsorb onto gills.Even then exposure is very unlikely because the soap adsorbs on soil and sediments very rapidly, generally before it adsorbs on gills.
You don't have any gills, right?
As I said before, the article and the study cited are flat out preposterous. The ignorance and lack of understanding of the science is appalling.