Oh, how did you find that? Some inside knowledge about HN or is that a well-known path published by Cloudflare sites?

Edit: Seems to work also for at least some other Cloudflare sites. Interestingly HN is served from Stockholm (behind a sea cable) while others are served from Helsinki (should be closer). Not enough hackers here in Finland?

Edit 2: Works also on sites where Turnstyle keeps me out.