The Israeli regime is conflating criticism of its policies with "antisemitism".

So? The issue isn't whether the Israeli government is deflecting criticism. The folks withholding their support for El-Sayed aren't saying that El-Sayed or Piker cannot criticize the policies of the Israeli government. Their concerns are different. They deal with whether criticizing American Jews for supporting the existence of a Jewish state, or being anti-Zionist, or not affording the Jewish people the same care and consideration in talking about these matters that we afford other groups, is something that's dangerous for American Jews. Or considering American Jews being "invested" in issues concerning the security of the country of Israel is a problem, but American Palestinians being similarly invested in issues concerning their fellows in Palestine - or advocating for a Palestinian homeland - is not.