'These trails exist, despite being on "private" property.  Access tags should be used instead, such as "access=private".

"Private" roads and trails should be deleted from the database and map.  You can read more on why they won'"'"'t be deleted here:
https://wiki.openstreetmap.org/wiki/Why_we_won%27t_delete_roads_on_private_property'

https://www.openstreetmap.org/changeset/140069168