How can they compare the sales of a $250 standalone device to one that is
at least $500 and requires a computer with iTunes installed? There are too many other variables besides "Rock Band, GT Racing and high-res cameras" to make the claims that article does. (It is true that my iPad has none of those.

I bought it for photo display and video playback. Not books or magazines!)
I suspect that since the Nook is a sales outlet for bookseller, magazines are probably right up front and easy to browse and buy. (I don't have one, so I am only speculating.) On the iPad, I have no idea what I would have to do to get a magazine, which ones are available, or anything like that. To me they are devices for completely different markets.
They could say that women's magazines outsell men's magazines, but to flat out say that the Nook is more appealing to women than the iPad, or to even say that women prefer the Nook over the iPad for magazine purchases, is a rather large leap. I'm sure there are lots of women who have iPads that don't read magazines on them and that there are lots of men with Nook Colors that don't read magazines either.