That doesn't make Hacker News European. It is American. Y Combinator is American even if pg is originally British. Stripe is American but its founders are Irish.
Yeah i know, my response was a clarification that BenoitEssiambre was referring to the founder, not the site itself. My interpretation of the "so there's that" part of the message, was an acknowledgement that Hacker News is hosted in US, but if nothing else the founder is living in UK.