Just tried clicking that link, and got a huge pop up refusing me access to the site, and accusing me from being from a site called Hacker News (???).
According to the text in the screenshot you’ve posted, there is no referrer header, so perhaps you’re using some privacy extension that strips referrers.
Looks like uBlock Origin triggers it. That’s annoying, but whitelisting the site fixed it.
Yeah, that’s not happening. I only whitelist sites I trust, and that little pop-up doesn’t engender trust.