Tangent, but I deeply appreciate the treatment of footnotes on this article, just floating alongside the text in the right gutter instead of at the bottom of the article. It seems so obvious (at least on desktop) but I haven't seen it before. It's so nice to be able to see whether it's something I want to read, or just a citation, without clicking and losing my place (yes, I know there's usually a link back to the article flow, but especially in the "sticky header" era we've been in for decades, that rarely works well).
On my tablet (always in landscape, not lacking space), with "desktop site" mode on, the sidenotes are turned into footnotes anyway. (The text is unnecessarily large: perhaps what happened was like mobile device? -> make text big -> no room for side notes now.)