It is all on paths but if you want to delete knock yourself out but bear in mind there are lot unmarked routes on OSM and all maps in fact. Forestry tracks for example have no markings.. do we delete those as well? And there are many 'tracks' shown on OS Maps that aren't signed footpaths. You do what you need to do. At the end of the day I know exactly where the route goes do don't really care one way or the other.

No, it's a fell running route with the aim to complete the entire 70+ miles in under 24hours...