We definitely have evidence of cancer being present in the animal kingdom (that includes humans) deep into the fossil record so I might suggest that they are mistaken.
Pruitt, S. (2019, February 11). "How Old Is Cancer? At Least as Old as the Start of the Dinosaurs, Fossil Shows." HISTORY.
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[ 3.2 ms ] story [ 14.6 ms ] threadPruitt, S. (2019, February 11). "How Old Is Cancer? At Least as Old as the Start of the Dinosaurs, Fossil Shows." HISTORY.
https://www.history.com/news/cancer-dinosaur-fossil-earliest...