Such “summaries” do not replace, but complement the descriptions of the videos from the authors
Google’s New Experiment: YouTube Tells Video Content in a Brief from AI
As stated in the description of the new test feature, annotations can appear on search and browse pages. At the same time, the automatically generated “summary” does not replace, but complements the description of the video, which is created by the author of the video.
The experiment is conducted among a limited number of videos and users, only in English