Ad hominem for criticism

Hungarian sceptics were quite delighted to hear that a TED-conference was being organised in Hungary in cooperation with the weekly HVG. They were also quite surprised when they saw that the programme contained István Tasi [ishtvan tashee], whose ideas they know but to well. His book about "biology" is available in English, too (he also claims the book was a finalist at the USA Book News 2009 Best Book Award, though it seems each title paid for being listed becomes a finalist there). As the title of his presentation was identical with the title of his book, the sceptics wrote an open letter to the organisers, suggesting not that they cancel his presentation, but that the topic was changed to something more in line with his career, such as religion (their letter is available also in English http://criticalbiomass.freeblog.hu/files/2010/1/tedx/TED-Open_Letter.pdf). The organisers and Tasi said that this was a misunderstanding and the presentation was going to be about religion, anyway, and everything seemed to be all right.
Now, three months later,