Not sure comparing job postings is that accurate
If you want top level AI talent (or top level talent in any field) you don't post a want ad. You have headhunters go after specific people and create a position to fit them.
Maybe it is just what the tech press wants to write about, but you hear about Apple or Amazon hiring some top AI person, but you never seem to read about IBM doing it. Though maybe they are, and it just doesn't make the news.