Unable to answer "How does this path cross the barrier here?" – https://osm.org/node/2687182471 via StreetComplete 63.1:

It is a door into a walled garden

Attached photo(s):
https://streetcomplete.app/p/344043.jpg
https://streetcomplete.app/p/344044.jpg
https://streetcomplete.app/p/344045.jpg