This question could be best answered by Daniel dang, hn @ ycombinator.com. The automated scoring and flagging algorithm's are not publicly available AFAIK.
May I ask what [dead] means on HN?
Look at this user for example, he was posting for a year and guess what, for a year of posting, all of his submissions are dead, without him knowing, only the first 9 submissions from 2021 that are visible, only 9 from ~58 and he keeps posting because he don't know that his submissions are not visible.
https://news.ycombinator.com/from?site=alkeshghorpade.me - https://i.imgur.com/Ely4AfP.png
I don't think this is right
You can just write the email in the Contact link at the bottom of the page with questions to the mods. And the reason for not telling the poster that a link is dead is that they will just try to circumvent the block immediately.