The Great Berber revolt

I just do not know why such a good leader Maysara Al-Matghari isn’t talked about in the Moroccan history? According to our history books and what I’ve learned in high school, the Ummayad caliphate brought Islam to North Africa “yay we finally became civilized” without talking about how ummayads did it and how they ruled our beloved land. So our history books instantly jump to Moulay Idriss the first coming to Morocco to form our kingdom, skipping a GIGANTIC event of Berber revolt, which was led by Al-Matghari, the founder of Barghawata confederacy, to kick out the Ummayads that robbed and enslaved us in the Battles of Bagdoura and Nobles. What do you think are the reasons for the cover up?