As the author of the post, I can confirm it is legitimate (poop emoji dot st). I was hoping HN would allow it to come through as emoji instead of punycode, but tripped some kind of inapplicable server error.
It (an emoji domain) does pose a corner case of a problem for them (HN), so I haven't brought it to their attention yet.
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[ 3.4 ms ] story [ 19.0 ms ] threadIt (an emoji domain) does pose a corner case of a problem for them (HN), so I haven't brought it to their attention yet.