Deletes "People also watched", "For you", "Previously watched", "From related searches", "Latest from", "Popular videos from today", "New channels for you", "People also search for", "Shorts", "Latest Shorts from", "Recommended playlists" and "Recommended videos" Sections from Search Results, Playlists and Channels on YouTube
Just tested it, seems to work at the moment.
Didn't see any bullshit sections like "for you" or "watched previously" or other nonsense that YT injects into search results now.