Hello, Welcome to OpenStreetMap.

Actually, these highways do connect to a pedestrian area highway, so they are not really disconnected. Whether they are considered routable by apps or by yourself is not reasonable grounds to delete them. Anything that is ground truth and verifiable is welcomed in the OSM database. If you can't make amendments to correct the problems you see this again is not reason for deletion. Best to leave it, maybe someone else can make improvements.

Thus I've reverted the deletions.

Regards Bernard.