According to YouTube, the video results carousel will use AI to highlight clips from videos that "will be most helpful for your search query," which essentially means that it will take clips from videos and play them right in results, so people may not need to click into a video to find the information they're looking for.
Google uses AI overviews for Google Search, but the YouTube version will differ. AI won't summarize videos, and will simply pull clips from them. It is not clear the AI-selected clips will encourage users to watch a full video, or cause fewer people to engage with videos, but AI integration into Google Search has impacted traffic to websites.
For the use case of looking for some tutorial on a thing or a recipe or something and having the option of skipping straight past all the watchtime-boosting filler content and straight to the answer this seems like a decent solution if it works semi-reliably. I imagine since they are pulling full transcripts for subtitle generation already it's just a text search with a timecode.
I will also buy into a setting to get past "Hey guys, welcome to my video!" and "Please like and subscribe" automatically, but I doubt Google is into that.
I mean, they're doing it to everybody else, so...