I don't believe that it has been certified (EcoLogo or Green Seal) as eco-friendly, rather it is a better (i.e. greener) alternative to harsh chemical based stain removers/cleaners. I believe this is the basis of the "eco" label. I'm not implying that they use anything dangerous, just that it is uncertified most likely due to their lack of patent protection (interpret this as lack of divulging their formulation for others to copy).
In this link it would fall under may of the itemized points, for example: lesser of 2 evils.