https://ibb.co/sCHB7th
https://news.ycombinator.com/item?id=26312652
https://news.ycombinator.com/threads?id=bopbeepboop
I cannot find any other explanation besides a botnet that targets specific users for instant downvoting when they post a new comment. Perhaps I'm mistaken, but I thought it would be good to bring this up to the attention of the community.
Edit: just confirmed that this wasn't a fluke, a response by that user to the thread he's involved in is again showing as dead, at 0 minutes: https://ibb.co/P6KghWr.