How is this exact dupe URL possible? See https://news.ycombinator.com/item?id=33711724
And in this case..
cmp <( echo -n 'https://jcs.org/subtext' ) <( echo -n 'https://jcs.org/subtext' )
Maybe 14 hours is enough that HN allows to post it again. Some score threshold could be involved to allow reposting after certain amount of time as well, to allow something more attention if it didn't get enough attention initially?