The wikipedia page on Donziger [1] says that the main witness to those bribe accusations retracted his statement and gives [2] as a source for that retraction. It seems, that the US courts did not consider that retraction, though [1].

[1] https://en.wikipedia.org/wiki/Steven_Donziger#Kaplan's_2014_...

[2] https://www.vice.com/en/article/neye7z/chevrons-star-witness...