I didn't think that was ever in doubt, was it? HN has always been difficult to use on mobile devices due to all the fixed dimensions forcing the page to render at an unsuitable size.
If you resize desktop browser window you see that is scales well. The width is set to 85%.
I assume that most popular mobile web browsers render HN the same. This could mean that there are some standards for mobile devices that make it look as bad as it is. Unless you are someone who really wants to and can change the standard I assume that you start complying with it. :)