The reason for the retraction: Monsanto wrote the paper and three corrupt "scientists" attached their names to it. Every bit of research critical of glyphosate was simply left out from this review paper and it was used in literally every regulation on glyphosate around the world justifying it's use as a "safe" herbicide. Best investment Monsanto ever made.
It took honest scientists 25 years to finally have it retracted, because glyphosate does cause cancer after all, as Monsanto's internal research already demonstrated many decades ago.
It should tell you something about the balance of power between corporates and scientists.