Perhaps the account the OP was concerned about wouldn’t have turned up in the stylometry demonstration it linked to if HN had deleted it one, five or ten years

Perhaps the account the OP was concerned about wouldn’t have turned up in the stylometry demonstration it linked to if HN had deleted it one, five or ten years ago. Yes, there are permanent risks for past posts but that’s no reason to throw up your hands and give up on any and all attempts to mitigate them going forward.