It's a Show HN. People typically don't post Show HNs for what they made 25 years ago.

  > whois urlshortenersaresoyesterdaytrythisamazingsuperlongurlexpander.site
  ...
  Domain Name: URLSHORTENERSARESOYESTERDAYTRYTHISAMAZINGSUPERLONGURLEXPANDER.SITE
  Registry Domain ID: D492058866-CNIC
  Registrar WHOIS Server: whois.hostinger.com
  Registrar URL: https://www.hostinger.com/
  Updated Date: 2024-10-08T18:01:33.0Z
  Creation Date: 2024-10-08T18:01:29.0Z
  Registry Expiry Date: 2025-10-08T23:59:59.0Z
  ...

so no, it can't be more than four days old.