And this message was received by me loud and clear in Shar Yashuv in NY. And even until today I hold by with this message. But I consider that "learning Torah" is limited to what we actually know to be the Written and Oral Law. You can't just add what you want, just your own personal thoughts, write them in Hebrew and then call it "Torah". Which means the 99.9% of what is called "Torah" nowadays is deception.
What is the Written Torah? That is clear-the Old Testament. The Oral Torah is also clear. The books written after the destruction of the Second Temple --at which time the entire Oral Law was collected and edited by the sages of the Mishna and Gemara. So what comes later can not be called the Oral Law. However, some of what comes later can be included in a secondary way when it is just commenting on the two Talmuds or Midrashim. But not when some jerk makes up his own "stuff" and calls it "Torah."
Zohar was unknown until the time of Moshe DeLeon. He claimed it was from R. Shimon ben Yochai.. But so what? What would you say if the Talmud was unknown until the Middle Ages, and then someone claimed they had discovered it? Would it now be thought to be the Oral Law? Of course not.
Besides that עם כל דא [translation of עם כל זה although] was invented by Ibn Tibon.[Although in the time of R. Shimon ben Yochai was אף על פי או אף על גב] So the fact that עם כל דא is all throughout the Zohar shows it was written in the Middle Ages.
[This is not meant to dismiss the great mystics, Avraham Abulafia, the Remak Moshe of Cordoba and Rav Isaac Luria. And even if the Ari and Remak got inspiration and ideas from the Zohar that does not contradict their own authentic mystic visions.]