https://wiki.openstreetmap.org/wiki/Tag:access%3Ddesignated

> If an element is meant only to be used by specific designated transport methods (overriding whatever defaults may exist for that way), use access=no in addition of the *=designated value.

>> overriding whatever defaults may exist for that way

>>> defaults: https://wiki.openstreetmap.org/wiki/OSM_tags_for_routing/Access_restrictions#Ireland

Such tag usage goes against the documentation and should be reverted. I started a topic on the forums: https://community.openstreetmap.org/t/access-no-foot-designated-on-highway-footway-should-it-be-reverted/101907