Jadis The Witch
I was mistaken, the far northern lane is in fact a bus bike lane. My confusion came from the fact that it receives far less traffic than the solid line bike lane.

I'm still not sure of the best way to tag this however. The most relevant example like this that I can find is example B1 on this section of the wiki.
https://wiki.openstreetmap.org/wiki/Bicycle#Cycle_lanes_and_bus.2Ftaxi_lanes