It's probably because your first comment contains a link, and automated account creation for spamming purposes is unfortunately a thing. The site relies on users with high enough karma clicking a button to vouch for legitimate users to unban accounts (or draw the mods' attention), like what happened to you here.
Hacker News uses shadow-banning, so the person banned for problematic behaviour can't tell and doesn't just switch to a new account.
On Topic again: c2.com is great, I'd love if someone would take ownership and keep maintaining it.