It isn't. But these tropes that are constantly used are a lot like "blackface" for Jews. You wouldn't understand it if you had little knowledge of the history of anti-semitism any more than a white person with little knowledge of the history of racism in America understands blackface.
While I agree the 'sneaky Jews and their money paying people off' is absolutely a longtime racist trope used against Jews it does happen to be the case that Israel spends a pretty significant amount of money on US lawmakers for the express purpose of influencing their opinion. They certainly aren't alone in doing so but from my understanding (which isn't great and I'm open to being corrected), they spend money on lawmakers in larger amounts and more openly than the overwhelming majority of countries.
So while I get the whole concern about that slur in this case it appears to be literally true.