Probably cuz the MBA isn't a touchscreen?
Of course Logitech probably paid for it. How else do you think MacRumors pays for the site? Advertising. And yes, ethically IF Logitech paid for it, it should be a "sponsored story" as you put it.
This comes up every time MacRumors runs a story about a new product.
Each time one of the moderators post something to the effect of "
MacRumors does not post sponsored stories".
I'd remind those complaining that its rather arrogant to complain that just because you don't have any interest in a product, does not mean that no one else has an interest in it.
If it was a product you were interested in, you would not be complaining about "sponsored posts".
Myself, I am interested in this, although unlikely to spend the money to buy it. To have to worry about spare batteries, etc. for the keyboard defeats one of the purposes of the iPad which is that it can fit in a tiny package and has a long battery so you don't have to worry about it. To never have to worry about batteries for the keyboard is useful imo