Ah! No, no, that's not what I meant at all. User noobermin guessed that the web page was written in TeXmacs and exported to HTML by analyzing subtle hints such as the typeface and the color of the links. I pointed out that of you actually read the article there is no need to interpret these clues, since the article plainly and explicitly states it was written in TeXmacs and exported to HTML!
Does that clear things up?