Hi, and thanks for your contributions! In this case, were you able to verify that the trails you deleted really don't exist? What's your source for the deletions? Just because something isn't maintained or sanctioned doesn't mean it is non-existent. By leaving real features in OSM and tagging them appropriately (such as informal=yes or access=no) we can also prevent later unaware contributors from re-adding them anew (often with just highway=path...)