It's definitely anti-Semitic! He's acting like _all_ Jews are pro-Israel and therefore pro-slaughtering. That kind of stereotyping is bad.
Next up, let's write an article critical of Hamas and start with "If I were a Muslim, I would be concerned about my insatiable appetite for war and killing".
This serves their interests, but the framing shouldn't be accepted. There are plenty of non-Zionist or anti-Zionist Jews, or even Zionist Jews who have specific concerns about the treatment of Palestinians in Gaza and elsewhere; it's a little funny seeing people like Bernie Sanders being deemed antisemitic, for example.