Hello Chris, Neil P here. My first post on this tinternet forum ting!
I don't think you're too far out with Azilal, I think it's just near Zaouia-Ahanesal. Back in the DT days we used to always do what we called 'the Cathedral rock loop'. We'd camp near the bridge over Bin el-Ouidane lake (just south of Ouaouizarht) and then send the bikes around the loop to Azilal and on to the Cascades d'Ouzuod. It was too tight for the truck, but I don't remember it having those big drops shown in the vid, so i reckon it's maybe the off-shoot from that loop-piste, down to Zaouia-Ahanesal. Dunno for sure, but in that neck of the woods is my guess.