The Haaretz article makes no mention of Holocaust denial, only that the article, which appears to have some historical factual basis, was published in a verboten journal. The subject at hand was academic boycott of Israel. An open discussion by academic professionals on both sides of this controversal subject evidently was not going to be permitted.
Australia's most dangerous Islamic State operative killed in U.S. strike (AP)
from the article: U.S. Jews block conference set to include anti-Israel professors