This is verifiably not true. Here's a comment [1] written by an account that is currently two hours old. Its visible to me if I'm logged in, with or without showdead enabled. Its also visible in an incognito tab where I'm not logged-in. As others have said, you probably posted something that triggered a filter. [1] https://news.ycombinator.com/item?id=47553799
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That doesn't make sense. How would people be able to reply to a comment that was hidden?