Pretty much yeah, but this is something that would've happened regardless. If relations weren't strenghtened between the abbasid provincials and the berber tribes, eventually it would backfire into a mass revolt that throws up the entire region from abbasid control, and obviously would cost a lot since the Caliph would try to quell it (not spoiling or anything but with the actual situation the independence of the Maghreb probably will be a lot smoothier than OTL, this going for both sides).
More mainstream sunnis than OTL, Zaydis don't have quite a significant presence but Ibadis/Kharijites in general are significant, especially among nomad tribes, the ismailis have their space as an urban minority in lesser cities, nothing that worries abbasid control over the region. In a bigger scope christians still a majority, although there's coming a first wave of widespread conversion that'll affect mostly the re-urbanized areas around Carthage, Constantine and Saldae, it won't remove their majority status for now. Especially since with the moment there's pretty much zero motivation for christian berber tribes to go Kharijite so...
Pretty much and it wasn't like the Rhomaioi had very tight control over the island, it was pretty much a bunch of big landowners managing their own land + fighting against other landowners.
For now, as OTL, although butterflies may change the dynamic in the future...