OpenStreetMap should represent ground truth. Although there is "officially" a military area in Jaizkibel, it is no longer in active use. Only a small shooting range remains, which appears to be abandoned. There are no signs or indicators suggesting that this is a military zone.

Usually, military areas are closed to public access, but this is not the case in Jaizkibel. This could discourage hikers, bikers, drivers, and other visitors from exploring the area.

There are no military operations currently taking place in Jaizkibel. Following incidents like this one, there have been no further military activities. https://confilegal.com/20230614-carcel-para-un-sargento-y-un-cabo-del-ejercito-de-tierra-por-un-accidente-con-dos-heridos-por-un-camion-al-que-no-le-pusieron-el-freno/

The area has been added by someone for political reasons, using non-standard language and naming conventions. Additionally, the spelling “Jaizquibel” is incorrect and would be questionable even with the missing accent mark.