Still unresolved. It looks like the Fort area (https://www.openstreetmap.org/relation/7409047/history) is a "military reservation" (source: https://en.wikipedia.org/wiki/Fort_DeRussy_Military_Reservation).

In that case, it should be tagged as military=training_area (with other required tags). But its an odd one since it seems to be access=permissive. Should those tags be added.