Each brick piers sitting on a single concrete paver approx 500x250 mm.
I think that those "concrete pavers" were the caps on top of the piers. There is a low brick wall on the far edge of the decking which the piers were probably attached to. Having said that, probably not the best type of construction given the leverage affect that the wind would exert on the bricks, when you think that most fence posts go 2 or 3 feet into the ground.