That's an inverted way of repeating what i said, yes?No, for a 'ball park' figure the materials cost is a third of the total cost.
But for your job it quite easily be a lot more than that. Depends on how much surplus rubble is generated and it's disposal. How long it takes to demolish and dig out. What is needed for reinstatement.
I meant the fencing materials and didn't take into account the cost of removing the rubbled remains of the wall.