I really don't know why you can't accept that someone knew this before you. How insecure must you be?
the link was about how the new aspect ratio makes it hard to compare screen sizes. it is the same problem for all phones.
leaks of the iphone have been around for months too. may:
https://9to5mac.com/2017/05/30/iphone-8-dimensions-size-comparison/
or even as early as february, talking about a 5.8'' screen with the size of a 4.7'' iphone and showing the new aspect ratio:
http://bgr.com/2017/02/16/iphone-8-release-specs-display-touch-id/
let's not forget about the CAD schematic leaks in may, the dimensions were spot on.
https://www.macrumors.com/2017/05/10/iphone-8-cad-renders-images/
the homepod leak a month before the keynote, definitely confirming the notch from early mockup devices:
https://9to5mac.com/2017/08/10/home...e-8-screen-layout-resizable-home-button-more/
https://www.macworld.com/article/32...ails-we-learned-from-apples-homepod-leak.html
and the iOS 11 GM leak, removing the last shred of doubt, days before the keynote:
https://www.macrumors.com/2017/09/09/ios-11-golden-master-leaked/
while many of those were very early and made it hard to be sure at the time, the HomePod and iOS leaks definitely confirmed all the previous rumours ahead of the keynote and left not a single bit of doubt that the earlier leaks were actually true.
but i have to say it was actually fun to "go back in time" now and follow the trail of what became the iPhone X.