This defence is complete bollocks and has very little to do with why
@Bosnian_fan's post was blatantly antisemitic. You wouldn't describe Biden, or Labour/Tory politicians as having "infiltrated" positions of power would you? What you think they've smuggled in their Zionism via the back door to unleash on an unsuspecting nation? Bullshit. If your go to is that all these people are zionst then you don't use the word "infiltrated" you just say it as it is: Zionism is a dominant philosophy in American politics and society and you recognise the US as being full of willing ears and full throated supporters.
This is the familiar motte and baily fallacy. We open with the bailey: There are sinister forces infiltrating the corridors of power, some of them buying our politicians and all of them placing their secretive hands on the levers of government. Then, when pressed, we retreat to this motte of yours: "not all zionists are Jews, look at all these obvious zionists in positions of power".
This second argument is so unlike the first that it bears no relation to it. Bosnian_fan specifically avoided saying Jew, but the intent seems evident enough to me.