You're not going to win this fight. Content makes it the the front page of HN (and Reddit and other user-generated content sites) by getting upvotes. You just have to accept that you may see content that isn't new to you. If it is on the front page, that means enough people haven't seen it yet.

Edit: I have already seen the website as well, but I was glad to see it again because I could come to the comments section for some good discussion.