The UK Labour Party has published a manifesto on what is and what isn't antisemitic in a very late attempt to stem the PR damage from the hundreds of examples of antisemitism that have been documented from its members, as well as the coverups and excuses for that hatred.
Of course it is too little, too late, but the actual contents are fairly good. It even refers to the IHRA definition of antisemitism.
Here is part of how it deals with Zionism:
[O]pposition to the Israeli government must never use antisemitic ideas, such as attributing its injustices to Jewish identity, demanding that Jews in Britain or elsewhere answer for its conduct, or comparing Israel to the Nazis. Many Jews view calls for Israel to cease to exist as calls for expulsion or genocide. Arguing for one state with rights for all Israelis and Palestinians is not antisemitic, but calling for the removal of Jews from the region is. Anti-Zionism is not in itself antisemitic and some Jews are not Zionists. Labour is a political home for Zionists and anti-Zionists. Neither Zionism nor anti-Zionism is in itself racism.I want to concentrate on the bolded section.
In theory, it should be possible to have a single state where everyone has equal rights. In that case, it shouldn't be antisemitic to advocate such a solution.
In reality, both the people who advocate a binational state and those who oppose it know the truth: it is merely a stage to ultimately make Jews into second class citizens, as they were in Muslim majority countries for centuries.
It would be very democratic of course - voting that mosques must be higher than synagogues, and that Jews cannot visit their holy sites that Muslims also claim, and soon enough that Jews must wear special clothing - and worse.
I gave lots of other reasons why a binational state is just a smokescreen for putting the Jews in their proper place as dhimmis, subject to attack from their woke Arab attackers, here.
In other words, saying that pushing a binational state is not antisemitic is like saying the Germans who built gas chambers weren't doing anything wrong since they merely made a building.