Yea that phrase also caught me off guard and had me wondering what year this was.
Why? DOS is probably the CLI by far most people know. Naming anything else would be pretty stupid.
Why would he be a Mac user? Since he mentioned DOS I think it's much more likely he's a Microsoft/Windows guy who remember the DOS days.
Mashable is a silicon valley operation, I just assumed... Plus the same goes for Windows and the command prompt, but in the valley, unix is ubiquitous, and yet non-existent as far as the press knows.