Yes, according to that article it seems that it is more related to the Swine subtype than to the Avian subtype. But that is not the general view, see for instance http://www.cdc.gov/ncidod/eid/vol12no01/05-0979.htm
It was probably multiple reassortment events that produced that virus.
Now I have read the article not only seen the tree, and the nucleoprotein (NP) gene is somewhat related to the Swine subset, but the other parts of the virus is avian. So the general view is still avian origin of the 1918 virus.