At least some of this is mentioned in the US court judgement linked to in the article: https://casetext.com/case/chevron-corp-v-donziger-28 (under the heading "Donziger Causes a Change to Less Probative Tests When the LAPs' Experts Find Pollution that Likely Was Not Caused by Texaco" and in subsequent and preceding sections). I think there may have been news coverage that went into further details, can't remember where though.