Hi there. 
There's a route relation for the night bus that travels along Balaclava Road.
As for the duplicated nodes, public_transport=platform is where passengers wait and public_transport=stop_position is for where the bus stops on the road. 
You're right that having both is unnecessary, public_transport=platform is generally preferred but having both isn't wrong. 
There's about 1000 bus stops mapped with both tags across Melbourne so I'd recommend leaving it