Suggestion: post before tweeting.
I'll probably do that next time. I didn't think it would matter! (And really it doesn't -- it's not as if I need the karma points.)
> And really it doesn't -- it's not as if I need the karma points.
It's the principle of the matter! Does HN allow bot submissions?
Or better; assuming the URI is known before posting (it's not randomly generated on submission or encapsulates absurdly precise submission time) just post it to HN a fraction of a second before it's live. Nothing any script can do to beat you then.
And to your question, dwaxe is not a bot (there are comments associated with the account too), and this has happened before (apparently a lightning fast submitter):
https://news.ycombinator.com/item?id=12218797
Of course he/she could still be running a script.