Much probably comes down to how you define it. If you believe "from the river to the sea" is antisemitic, then absolutely.
I am not fully sure about the history (though I have looked into it a little) and can see arguments on both sides. That said, all of the people, the students, I have talked to seem to be using it a support of Palestine rather than an attack against Jewish people.
But it lives in the gray area where one can interpret it whichever way fits their views, it seems.