TIL HN still doesn't support rfc3492, 23 years after it was published, and so this domain is not rendered correctly on the site. :(
(It should appear as: マリウス.com )
Nowhere does RFC 3492 say that browsers MUST render IDNs in the original language, so I think saying "HN does not support" this RFC is false, or at least disputable. Personally I strongly prefer having it in untranslated Punycode to avoid scams; IMO everyone should browse the web with Punycode disabled.