I feel the message of unlocking is strange

Think phrase "Lock broken" probably still has importance. But agree "anyone can edit" is vague. maybe something like "Lock Broken. Content is now editable by users with appropriate permissions"

Seems to be a duplicate of https://www.drupal.org/project/content_lock/issues/2925274 ✨ Rename drupal messages Needs work , can maintainer move over credit from those that worked on it a few years ago.