That the entire Jewish population being tied as a synonym to a foreign government's actions, and that literally any criticism of that government's actions is deemed anti-Semitism, is itself pretty damn anti-Semitic and downright hypocritical.
Exactly. If the Jewish population of the US and the Israeli government are viewed as indistinguishable, then nothing about the dual-loyalty "canard" is actually false or anti-Semitic. The proponents of this perspective are absolutely loyal to a foreign nation to an equal/greater extent than they are to the US. Think Jonathan Pollard, minus the espionage.