Robert sent in the link https://www.livescience.com/animals/whales/this-colossal-extinct-whale-was-the-heaviest-animal-to-ever-live … which is more about eye capturing the reader than about reality. The weight is an estimate and the animal was not as long as a blue whale. Robert is critical of the press release, saying it is interpolated from the discovery of a section of backbone.
It was found buried in the Andes foothills of Peru. The average elevation of these hills is around 400m, according to Robert [using Google Earth]. There is also no explanation as to how the whales got there. It lived 39 million years ago, during the Eocene. It has an estimated bodyweight of 187,000 to 750,000 pounds, or 85,000 to 340,000 kg. Some 13 vertebrae from its backbone were dug out of the earth, with 4 rib bones and a hip bone recovered later. The author says they went for a conservative estimate of its size. The implication is that it might have been bigger.