Mark Halpern is not a linguist, in fact, some of his earlier articles in TVR are trashings of linguists. One of the sites I got to through Google (http://makeashorterlink.com/?C51E2018) divides polysynthetic languages into agglutinative (http://makeashorterlink.com/?F23E3218) and fusional (http://makeashorterlink.com/?W25E6118).