Yup, of course this is no coincidence. The "poem" is straight-out antisemitic. Old habits die hard, after all Grass had an SS history (that he forgot to mention over decades).

[Edit] It's kind of obvious, but I'll say it since this is often missed by those applauding Grass for his late poem: If Israel wanted to destroy Iran, it had already done so, given its nuclear power. Instead, Israel has (so far successfully) used that nuclear power defensively to keep its neighbor countries from trying to destroy it.