Those are in our Bar Magazine every single month, and yes, for known firms. They most like just want the person to have SOME experience in one of those areas, but that is not how they write the ads. Agree that they are looking for an attorney 0-3 years out of school because that’s what they want to pay.
It sometimes backfires. A government agency I worked for wrote a description for a job that someone had been filling temporarily and they wanted her to become permanent to that section of the agency. They wrote the job description so specifically that we all said “Oh, that’s M’s job” and no one applied. Well, they didn’t get enough applications to proceed (there is a requirement to have a competitive pool) and they had to rewrite it and repost it several times, and open it to the public which is another whole process.