Abdullah is the narrator so it is not his story. He is the son of a member of the Hamas political wing who are the civil authority in Gaza. They are relied upon for an immense amount of information, everything from the Palestianian death toll in Gaza, reports of water and food shortages, hospital and infrastructure updates. Every journalist reporting from the region relies on them for this information. Why? Because Israel will not allow any independent observers or journalists into Gaza.
Was Abdullah encouraged to do the documentary? Probably because it is in everyone's interest in Gaza to get the story of what is happening there out to the world.
This humanising portrayal of the children in Gaza is extremely affecting so it is no surprise that people are trying to discredit what is a very valuable documentary with amazing access to the inside of Gaza during the war.