i cant say who wrote that comment saying the only evidence is a piece on 60 minutes, but i can look at the articles listed refrences and see its not true;
References
* The Korowai of Irian Jaya: Their Language in Its Cultural Context (Oxford Studies in Anthropological Linguistics, 9) by Gerrit J. Van Enk, Lourens De Vries, & Enk De Vries Van (ISBN 0195105516).
* Korowai: in Encyclopedia of World Cultures - Supplement (Editors: Melvin Ember, Carol R.Ember, and Ian Skoggard) pp.183-187 by Gerrit J.van Enk. Macmillan Reference USA / Gale Group (ISBN 0028656717).
* Figures of alterity among Korowai of Irian Jaya: Kinship, mourning, and festivity in a dispersed society (Indonesia). PhD Dissertation, by Rupert Stasch, Department of Anthropology, University of Chicago (Unpublished).
YOU believe the random comment by some random reader of the article just cause it fits the point you are trying to prove. who's the MORON here?