Israel decided to move the goalposts to include criticism of Israeli policy in their own definition.

They have done no such thing Jim. They have a free press that criticises Israeli policy every day, and an opposition whose very purpose is to criticise Israeli policy.
Why are you always making false claims against Israel Jim?

The slur of "antisemite" is increasingly used as a political weapon against people who are in no way antisemitic.

Is it? Should antisemitism not be challenged and attacked because it might harm the political careers of the antisemites?
I think antisemites have no place in politics, and I do not believe it is all a conspiracy against Corbyn.
That is a delusion and proved so by the statements of pro Corbyn people like those in my BBC link.