Syme's point is that it's worthless as evidence. It means nothing. Less than nothing, because a group of Arab spies could easily select its most Ashkenazi-Jew-looking agents to go make the hit.

Just stop clutching at straws, basically. I don't think any of us here would be terribly surprised if they WERE Israelis, but apparently unlike you, the rest of us are willing to go by actual, rather than preposterous, evidence.