They have only covered the North at this present time, if the Somali government actually invited this Spanish team and gave them funding plus protection, they could make a similar map of the South-Central regions which also connected to the routes of the North and the Ogaden.
This is why this whole notion that Somalis were never united is BS, because this was one big intricate nervous system that tied everyone from the nomads, to the urbanites, to the merchants, to the Sultans, to the Scholars all together through these trade roads and sea lanes.