In addition to Cloudflare's usual nonsense (e.g., give us all the cleartext because reasons, and also unblock our bad-UX code that doubles as an additional tracker), it looks like Cloudflare here might also be blocking Tor exit nodes (either proactively, or in response to detected abuses from those addresses).
Probably because the HN hug of death looks like a DDOS attack.
Probably because they're using the cloudflare defaults which are terrible like everyone else.