Hacker News Reader

I've read this 5 times and I'm having a really hard time parsing what he's trying to say here. Can anyone help out?

the methodolgy of the bot that posts the deleted posts every 12 hours is explained here: https://old.reddit.com/r/RedditMinusMods/wiki/index

the graph just shows the number of posts that this bot has found "missing" each 12 hours