It seems the competition was for station foot crossing designs and this is a design for less urban area's in which you just need a foot crossing and no station.

It seems the competition was for station foot crossing designs and this is a design for less urban area's in which you just need a foot crossing and no station. Which would explain why it can accommodate a longer ramp up and down and less rigid in design limitations as you would get in the urban or main stations. So maybe cheaper, though if they was able to use this design in the more urban area's, would certainly have a larger footprint and that aspect may make it more expensive.