Hallo,

You cannot use a wikipedia/wikidata as a source of truth, you'll need something more official, like the Ajuntament d'Eivissa website you provided (pdf version: https://www.eivissa.es/documents/34357/51577/BARRIS.pdf). Notice there are some hoods still missing.

Usually the major cities have these boundaries defined by its own administration, not always though.

I saw your revert changeset. If there's no official source, that's how it should be then.

Thanks & Regards