I suggest you re-read this list: https://news.ycombinator.com/newsguidelines.html
The topic in this comment section is the "transition year" in Irish secondary schools. The format of the website which introduces that topic is tangential to that topic. I don't know where one would get the idea that a tangent that's not about CSS styling is not a tangent.
If discussion of anything but the underlying subject of the link - including references to the writer, quality, and content of the writing - were considered tangential to the point of being against the guidelines to discuss, then surely so would commenting that another comment is against the guidelines.