It rather supports the site's core point, because that point is about plain text files, not HTML and CSS. Plain text is as readable as it is possible to be.
Besides, this is exactly the kind of site HN constantly laments the loss of - unique, quirky, basic and rough around the edges.
> Plain text is as readable as it is possible to be.
Which is nonsense, of course, just like this site illustrates. Trivial formatting and layout changes make it more readable.
> Besides, this is exactly the kind of site HN constantly laments
And this is exactly the beside-the-point response you sometimes encounter on HN. I'm not a representative of the collective HN, so why does it matter that some other people did some lamenting some time ago?