From the same Blog-O-Pedia article you quoted, Boo:

"Critics of the concept argue that it conflates anti-Zionism with antisemitism, defines legitimate criticism of Israel too narrowly and demonization too broadly, trivializes the meaning of antisemitism, and exploits antisemitism in order to silence political debate.

Antony Lerman, writing in the Israeli newspaper Ha'aretz in September 2008, argues that the concept of a "new antisemitism" has brought about "a revolutionary change in the discourse about anti-Semitism". He writes that most contemporary discussions concerning antisemitism have become focused on issues concerning Israel and Zionism, and that the equation of anti-Zionism with antisemitism has become for many a "new orthodoxy". He adds that this redefinition has often resulted in "Jews attacking other Jews for their alleged anti-Semitic anti-Zionism". While Lerman accepts that exposing alleged Jewish antisemitism is "legitimate in principle", he adds that the growing literature in this field "exceeds all reason"; the attacks are often vitriolic, and encompass views that are not inherently anti-Zionist.

Lerman argues that this redefinition has had unfortunate repercussions. He writes that serious scholarly research into contemporary antisemitism has become "virtually non-existent", and that the subject is now most frequently studied and analyzed by "people lacking any serious expertise in the subject, whose principal aim is to excoriate Jewish critics of Israel and to promote the "anti-Zionism = anti-Semitism" equation. Lerman concludes that this redefinition has ultimately served to stifle legitimate discussion, and that it cannot create a basis on which to fight antisemitism."