Hi, physically the road does still exist I guess, but this area is now used as storage for the Grounds Team rather than as a means to get from A to B. The reason I removed it is because the path is showing on Mazemap suggesting it's a through route - there's no option to mark as private/restricted on Mazemap!
Ultimately though, I recognise that  Mazemap's limitations should be of no concern to OSM! So if you feel it should remain then I have no problem with that.