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That link shows me two completely different things on incognito and regular browser.

Incognito shows me the actual page, regular mode Rickrolls me.

EDIT: Oh, later in the thread they're talking about this.

I believe it's a redirect based on the HTTP Referer header. HN should set Referrer-Policy: no-referrer.

This always seemed like kind of a dubious feature in terms of privacy and security.