This is a reminder to curate and prune all your past social media contribution, because when this goes thru, you KNOW they will apply it retroactively. You'd loathe to lose your cushy job over a moment of lucid honesty back in 2011.
All HN threads are archived by the IA and there's data dumps of the whole thing under 50 GB iirc.
Going back and messing with comments will not help. The only way to prevent your posts from being associated with you is to never post or associate them in the first place.