Prophesy now means "to be willing to stand up on behalf of God even when no one else will".
The idea the prophesy is wrapped up in somehow predicting the future is rather misguided. In large part, the Prophets knew what God would find wrong in Israel's behavior. As a result, they knew what God had done before when His people strayed and that He would do such things again.
God did speak through them and tell them of more; however, being a true prophet is wrapped up in the definition mentioned above.
What I agree about this article is "Isaiah" I really don't understand how the rabbi interpeted prophecy from the Old Testament prophets.