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The default assumption is that it's not your article, unless you prepend "Show HN" (or there's something obvious like your username matching the domain name).

Of course! Glad you posted it. I didn't realize that many people would find it interesting.

I think it's fine. The author might show up otherwise others with interest in the area might reply.

You don't even need to say it's not yours, probably most that is posted here isn't from the author.