Say what? On the contrary, I think that it's splendidly simple to read LWN, because there's no distraction. It's a good, clean site; it respects the styling I instruct my browser to apply to it; it displays just fine in links, lynx, elinks, ewww, emacs-w3m, Firefox, Chrome, Safari, Internet Explorer, Edge — if that's not professional, then what is?
The HTML is very clean and readable. They do use CSS.
Granted, it doesn't look trendy. Indeed, it looks like something from the 90s/00s. But once one updates to a20`6 style, one then has to spend money in 2017, 2018, spring 2019, summer 2019, fall 2019, winter 2019, January 2020, February 2020 — one will be paying designers and artists until the end of time.
Would I appreciate a somewhat more current look? Sure. Would I trade good HTML and universal readability for a more current look? Hell no.