As a trick, you can use the API [1]. Get the story ID in the URL of your post, and place it at the end of the API call (e.g. [2]).
If the result has `dead: true`, your post is… well… dead ;)
[1] https://github.com/HackerNews/API [2] https://hacker-news.firebaseio.com/v0/item/35700745.json?pri...