I find it hilarious that this opinion piece is in The Guardian given that it's one of the newspapers which most weaponized anti-semitism accusations in their campaign against Jeremy Corbyn when he was leader of the Labour party some years ago, to the point of accusing a Jewish Holocaust Survivor of being an anti-semite (for, as member of a panel in a conference for Palestine, comparing the actions of Israel to those of the Nazis) in order to slander Corbyn by association (as he was in the same panel).
In fact the very same person who wrote this article was part of that very same campaign: here's one of her articles back then slandering as anti-semitic the Labour party when led by Jeremy Corbyn
These sleazy hypocrites' problem isn't the weaponizing of accusations of anti-semitism, it's that the ethno-Fascist populists in Israel aren't doing it in a posh contained way like they would and instead are just firing it out indiscriminately, so the use of accusations of anti-semitism for political ends is losing its potency.