Fascists get away with conflating Judaism and Zionism because they don’t teach that Zionism has absolutely nothing to do with Judaism, and actually goes against a lot of their values. It’s actually been around for quite awhile; you know the crusades, when they went around killing a bunch of civilians to set up settlements? Those were Christian Zionists.
That’s why it’s anti-semitic to conflate the two. One is a religion and the other is a fascist genocidal colonialist movement. So next time you see some german lady shouting down a holocaust survivor for calling out Israeli apartheid (yes, this literally happened) you’ll see it for what it is. It’s not complicated, it’s a clear cut case of modern day nazism.