Does someone have the direct link to the article itself.
Not having read the article ukemiwaza read to me as techniques used to attack. This makes much more sense in formal kata especially when one considers that traditionally uke was the more senior of the pair.
Atemiwaza are a class of Aikido techniques not limited to what uke does.
and by the way Ian - in Shodokan parlance what you guys call Shihonage we call Tenkai kotegaishi. Not sure what that has to do with ukemiwaza.