What I meant was that you can not put any trust in the contents of DNS labels, they should be handled as opaque blob-like identifiers. The only meaningful thing you can do with domain name is to compare it's labels to some reference.
So no, I don't trust that I'm on HN because of I put any trust in the domain "news.ycombinator.com" signifying anything. I only trust that I'm on same HN that I was on yesterday because the domain matches exactly the reference value. But the domain name could be anything, as long as it is stable.
Maybe it would be better to say "there is no inherent trust on domains". I trust HN today because I was on HN yesterday, and the day before, and last year, and 10 years ago, etc., and it's always been trustworthy (so far as I know).
But if I saw a link tomorrow for hackernews.shop and I went there, I'd be very suspicious.
