Most AP employees sit at computers and rewrite stories night and day, it's not like a newspaper or broadcast newsroom. A few might do a little reporting or add new info to update a story. Many are stories from member news organizations, a few are AP original stories. A later rewrite was done, a new headline was written. That newsman may not have liked the terms used earlier or just wanted a new headline because of the update. The new headline may have been written by someone on their website, or an editor. We have no source so could have been from any member news organization's site but it looks like an AP site. Members can do whatever they want with the story, the byline, the headline. My point is the change most likely means nothing except someone wrote a new headline. I wouldn't guess it's because AP suddenly saw the light.