Well, if they are talking about disconnecting an Ethernet cable they best show the connector for it probably. Seems like they simply didn't add photos of using an Ethernet connector via a USB or USB-C adapter.
For all that I critique about today's Apple and the questionable (to me) priorities of a few powerful designers in charge there who seem too fascinated with uber-minimalism too often at the cost of usefulness across a wide range of users (as well as at the expense of the "Apple experience" that's been replaced with a "me too" experience as if Apple's trying to out-do Android/Google and the old Windows phone instead of letting Android/Microsoft/others chase Apple), the one thing I can't critique about Apple is: when they buy into something, they stick with it hard and fast and completely, and with no apologies. They can update their entire website almost overnight and wipe out all the prior Apple-like page designs and replace them with a snowstorm white-out blanket of grey/white flat design spread out over way too much wasted white space. They force Phone 4 users to "upgrade" to iOS7 with no turning-back permitted, even if it pretty much bricks their expensive few-years-old phone. They replace a user community forum for help/questions that used to look like a well-run forum with something that looks like a blank white memo pad on Jony Ive's desk. Full steam ahead to one common theme.
No laptop produced by Apple at the moment has an ethernet port, maybe not for 5 years...nor all those beautiful additional ports seen in that photo. The fact that Apple hasn't decided to show an ethernet dongle clumsily connected to the one single usb C port on the side of a MacBook is very, very telling. To me at least.
Ha, come to think of it, a second big critique I have is Apple's lack of attention to detail now compared to 4-5 years ago. Perhaps that image is another "oversight." But I don't think so.
To reel this back to the topic at hand, all this relays to my critiques in post #4 above.
You've generally disagreed across the board with my critiques of iOS7-11's UI so I shouldn't be surprised here.