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Have I Been Pwned owner, pwned.
(htxt.co.za)
This is a most excellent place for technology news and articles.
It feels awkward to me. I don't think it's grammatically correct. To me, it doesn't add any clarity, especially when the comma could've been the word "got" or something, lol
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