What evidence are you aware of that indicates that they're even trying to come across as a scientific journal? I'm pretty sure they're just a standard Science! publication, like Popular Science.
Popular Science, Newscientist, and their ilk generally report about research that's published elsewhere, or write about engineers and scientists. Nautilus, instead, publishes original research, written by engineers and scientists themselves. I am not trying to say that Nautilus is intentionally defrauding the public, but they are pioneering a new grey zone between journal and magazine.
You're just repeating the claim for which I requested evidence. What's the basis for believing that they're publishing 'original research', instead of regular journalism? What's the basis for your claim that their writers are engineers and scientists?
And why is this 'grey'-er than scientists or engineers writing anything other than scientific journal articles, e.g. books, magazine articles, essays, like they've always done?