City wall looks like it is a duplicate of a nearby wall, or historic only, at least partially. It currently cuts straight across the educational landuse, in front of a shed which can be seen from the service way.

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From the wiki
https://wiki.openstreetmap.org/wiki/Tag:historic%3Dcitywalls

Walls that are still standing and in good shape probably qualify for both barrier=city_wall and historic=citywalls, in that case historic=* is obvious as all city walls are nowadays historic.

Note that existing city walls that are ruined, maybe with only foundations remaining may no longer qualify as barrier=city_wall but are still historic=citywalls.

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Mapillary 2022-09-16 by annekaro
https://www.mapillary.com/app/?pKey=651087220070579&focus=photo