I don't know why he mentions recommending to pure apple households. Surely if every computer (/phone/tablet) in your house is made by apple, you don't really care what anybody says about the competition.
Haha, I'd say I'm in a pure Apple household (though I run a personal Ubuntu server... perhaps I'm disqualified). I'm still considering the Nexus 7 even with the iPad "mini" on the horizon. I think there's something to be said from having familiarity with the different devices/eco-systems (especially as a developer). The reviews are also hard to ignore.
if you've heavily invested in Apple media, the benefits to an Apple device would probably outweigh any individual feature wins of the Nexus 7.
if you're more of a casual Apple household, meaning just hardware and no media, the Nexus 7 is likely a fine choice.
I think a lot of it is people replacing older PCs with new Mac laptops, picking up the AppleTV because it is so cheap then finally buying an iPad as more of a curiosity.
A lot of them didn't really pay much attention to the competition because they weren't serious, considered choices.