You are assuming that this big phony is telling the truth when he says that he was "active" in JDL. I never heard of him and I did not see him when I went to Skokie, Illinois in 1977 with Rabbi Kahane where we met all of the local Chicago-area Kahanists.
This guy is trying to make money selling books and selling stories. He knows that self-hating Jews control the publishing of books. So he tells them what they want to hear.
He is a complete fraud, and I urge people not to help this con artist by going to his videos or commenting on his videos.
Also, he is not a rabbi. Does he have smicha (rabbinic ordination)? Even if he does, he is no longer a rabbi if he tries to humanize the Amalekite Arab Nazi enemy and if he sets the example of Jews leaving Israel for the cursed galut.
This is a real traitor.