Hi, I wasn't the one who implemented that feature so I'm not entirely sure how it works.
AFAIK it's handled entirely on the front end with JS using the boards' JSON APIs.
I know this file handles most of it:
https://kereste.moe/js/recent_posts.jsAlso check out the put_recent_posts() function @
https://kereste.moe/main.jsYou could probably just feed these into an AI and have it explain what's going on.