Sounds very misleading. Web pages come from many sources, but most video is hosted on YouTube. Those YouTube videos may still be from Mayo clinic. It's like saying most medical information comes from Apache, Nginx, or IIS.
To the Guardian's credit, at the bottom they explicitly cited the researchers walking back their own research claims. > However, the researchers cautioned that these videos represented fewer than 1% of all the YouTube links cited by AI Overviews on health. > “Most of them (24 out of 25) come from medical-related channels like hospitals, clinics and health organisations,” the researchers wrote. “On top of that, 21 of…
While %1 (if true) is a significant number considering the scale of Google, the title indicates that citing YouTube represent major results.
Also what’s the researcher view history on Google and YouTube? Isn’t that a factor in Google search results?