Unfortunately, from what I've been told by one of the guys in Dell's Sputnik program, they gauge interest on the Linux Dell laptops strictly by the number of people who buy Developer Edition laptops. So the author is not helping the cause by buying a Windows 10 laptop and loading Linux onto it.
Believe me, I get it. The Windows ones go on sale, while the Developer Editions pretty much never do. I'm guilty of buying a Win10 one myself before this was explained to me. Just passing that info on. If you want to support the future of Linux on Dell laptops, I strongly urge you to buy the ones with Linux pre-loaded, from Dell.