Why are the methods of Swiss meditation teacher Diego Hangartner not validated in the journal «Nature»?

Diego Hangartner: Diego Hangartner studied pharmacy at the Swiss Federal Institute of Technology in Zurich: Diego Hangartner is educated to publish papers in Nature. As long as Diego Hangartner`s meditation practices are not validated in Nature papers Peter Gamma from www.petergamma.org will not visit his meditation courses in Zurich.