Yeah, weird to see a couple of linguistic mistakes like this in an article about linguistic mistakes. Another is the misuse of "latter-day". The article uses it to refer to an old thing that is analogous to a modern thing: "[a] latter-day 'yo!'" But "latter-day" actually describes something modern. (E.g., the "latter days" refers to the present age. See "Latter-day Saints".)

See also "latterly".