Hate to be the stereotypical pedantic HN commenter, but fwiw this normally works, I believe there's an exception with Ask HN posts where clicking "hide" will not fully hide it, at least last time I tried.
I have always avoid pushing “hide” since I assumed a new submission would pop up at the bottom and I never wanted to go beyond the top 30 as I feared I would stay on the site for a bit too long.
The issue with having a model that does it for you is that your going to immediately start fighting against it and its decisions.