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.
There was a discussion about this on PFI (Pandemic Flu Information Forum) the owner’s screen name is Monotreme, he’s some sort of scientist (I am NOT!!!) and he stated yesterday in answer to a question that newer info has determined that the 1918 flu was directly from avian, no swine. But I haven’t a clue, just trying to read and learn.