The headline does describe the article. The article has more detail about the motivations and nuance of why certain weight and fitness videos are being promoted less to children.
The platform will still allow 13- to 17-year-olds to view the videos, but its algorithms will not push young users down related content “rabbit holes” afterwards.
If they included rabbit hole in the title, it would still be necessary for a lot of people unaware of the term to read the article to find out what that phrase means.