I believe that Rabbi Kahane was more right-wing at the end of his life, then when he was actively involved in politics.
If you track his positions on the Arabs and on Israel's left wing, you will see his positions evolved over the course of time.
If he were still alive today, I don't think he would still advocate everything said in the interview.
I view the "Ohr Haraayon", Rabbi Kahane as the authoritative Rabbi Kahane. You are free to disagree.