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You're right, it doesn't mean that. But independently of that point, what HN does here is right.

And more than any other online forum would do, it's in fact an exercise in transparency, and super labor intensive to boot.

"more than any other online forum would do" - still does not mean it is right

"super labor intensive to boot" - it should be in the CMS code to show a flag if "edited".

in your opinion it is right, in my opinion it is wrong.