It's very much a dupe by HN's rules of dupery. It's just that saying 'dupe' went a somewhat out of style since it can come off a little aggro. 'Past discussion'

It's very much a dupe by HN's rules of dupery. It's just that saying 'dupe' went a somewhat out of style since it can come off a little aggro. 'Past discussion' is often just the polite way to point out a dupe.