Excellent detective work. The trends for bots vs humans are kind of disturbing in that humans (as detected) seem to be doing fewer votes and leaving fewer comments with time, while bots are doing the opposite. Is this another indication that the Dead Internet Theory is true?
Related, a real human on HN is limited to 5 comments per 6 hours, while bad actors simply need to create hundreds of accounts to avoid this limit.
DIT was misnamed... Dead Internet Prophecy would have been a better term, something that hadn't happened yet, but will come true in the future.