I'm just having a look through the original planning documents (PA/14/03594/A1), and at least in the first version of the Design & Access Statement (Part 6), these paths are described as:

"Riverfront promenades
Linking to the wider area including: pedestrian and cycle route, informal play, planting and seating."

Whether this made it into the final version or not, I don't know, but it certainly seems like the intent was for these to be shared footways.