We had nothing to do with it – we hired somebody else to do it, that was the claim. Retraction Watch points me to this article by Peter Waldman, Tiffany Stecker, and Joel Rosenblatt for Bloomberg – it includes this nugget:
Monsanto disclosed that it paid Intertek Group Plc’s consulting unit to develop the review supplement, entitled “An Independent Review of the Carcinogenic Potential of Glyphosate.” But that was the extent of Monsanto’s involvement, the main article said. “The Expert Panelists were engaged by, and acted as consultants to, Intertek, and were not directly contacted by the Monsanto Company,” according to the review’s Declaration of Interest statement. “Neither any Monsanto company employees nor any attorneys reviewed any of the Expert Panel’s manuscripts prior to submission to the journal.”
Which aleady sounds bad, not an independent review at all, since they bought & paid for it. But – spoiler alert – it turns out their own staff had editorial control all along.