From the auction:
"Not just some stickers that will wear out this has factory imprinted keys, You OS must have support for dvorak,i know windows does, tested it and it works great, keyboard is used but could use a lite cleaning."
So, in essence, you still have to change your keyboard layout in your OS. Which means the keyboard is still putting out standard QWERTY scancodes. And, given that Model Ms and Fs have identical keycaps no matter which row of the keyboard is in, you can have exactly the same thing on any normal Model M just by swapping the keycaps around.
I may be wrong but this sure seems like a dirty Model M with the keycaps pulled off and shuffled around. The arrow keys look wrong or out of position as well.