The path is routeable for bicycles: https://www.openstreetmap.org/directions?engine=graphhopper_bicycle&route=51.47497%2C0.02143%3B51.47208%2C0.02494#map=17/51.47379/0.02362 and https://www.openstreetmap.org/directions?engine=fossgis_osrm_bike&route=51.47497%2C0.02143%3B51.47208%2C0.02494 both use that path. So I'd say there is nothing wrong with the tagging. But as currently mapped it has only two junctions at the N and S extremities so it's not easy to get on or off it. Are there, perhaps, unmapped junctions with Annesley Road, or with R W Relief Road near Westbrook Road? 