You'd seriously expect NG not to laugh in your face if you turned up with a plastic, consumer-grade toy like a 70D? If you were nearer, I'd lend you my real camera (EOS-1Ds)
I imagine NG doesn't care what you take the pictures on. I imagine if you took the pictures on a pinhole camera made out of a shoe box, but they were NG quality, they would publish them. They are in the business of selling a magazine with stunning nature and subject photography, not worrying about the gear someone is using. I'm not saying consumer grade cameras would survive all their crazy treks through the wilderness, but that's different on whether they pics are good. (hey, would you not publish the photo from Mt. Suribachi just because it was a Speed Graphic and not a modern pro dSLR? It's an awesome pic, even with, a by modern standards, terrible lens)
These guys take good pictures regardless of the gear they have (just like Nadal would crush you with a racket from Kmart and you with some custom $5000 racket), because they are top notch photographers, not because of the model they carry. Remember the pictures from 5-8 years ago were good enough for NG, but were probably taken with a sensor that is likely inferior to current consumer grade cameras.