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Have I Been Pwned owner, pwned.
(htxt.co.za)
This is a most excellent place for technology news and articles.
Headlines are generally pretty flexible with grammar, because a good headline is supposed to be terse.
I think it's fine.
I think a professional headline would usually just lack the comma there. Headlines typically have weird phrasing (due to their terseness), but they're generally still grammatically sound.
I think "HackerNews owner hacked" would be a headline, rather than "HackerNews owner, hacked".
"Have I Been Pwned owner pwned" seems to be on par with "Headline English" to me