It can't be. I can't access the linked url (it's https: http://news.ycombinator.com/item?id=3575029 http://news.ycombinator.com/item?id=3575029), but as far as

It can't be. I can't access the linked url (it's https: http://news.ycombinator.com/item?id=3575029 http://news.ycombinator.com/item?id=3575029), but as far as I remember, if an HTTPS page links to (or redirects to) another page that is not on the same domain, the HTTP REFERRER field will be empty.