Yes indeed, what a ridiculous article/discovery. Fifty-five years ago at the Univ. of Iowa (home of the well known creative writing school), English PhDs were required to study Old Norse and Middle English. Other important language are Old French, Anglo Saxon, Latin, Greek, and French. Some people will say anything to make their name, even things that are well known for ages.
English is a remarkable and glorious mishmash of Germanic tongues from late antiquity, artificially superimposed Latin grammar, some P-Celtic and Q-Celtic loanwords (including, as Barry Fell pointed out, the one adjective in English that properly follows the noun, “galore”), medieval Danish and Norwegian, French (after the mid-11th century), more French along with Spanish and Dutch (from Tudor times), and Renaissance-era and modern-era German (from a couple of different dyings-out of the prior English dynasties). And in the US, loads of place names, food names, and animal names which are loan vocabulary from mostly vanished “indigenous” tribal languages. :’)