Cyclists often don't even dismount here, but there is signage explicitly marking it as a non-bicycle path🚳. Walking the bicycle here is not forbidden and using bicycles=no confuses cycling routers & maps, so bicycles=dismount is more appropriate since this foot path directly connects two bike lanes.

The down ramp is not marked as a pedestrian path, it's a paved segment that bicycles can use to connect to the causeway & bridge bike lanes. See https://vancouver.ca/files/cov/Stanley-Park-trails-map.pdf