While it's true that the New Windows 8 UI is likely a greater departure from the design of previous consumer desktop OS interfaces than is iOS (for better or worse), it remains saddled with Desktop Compatibility mode, user-exposed filesystem and mouse-and-keyboard-oriented UI elements. iOS was a clean break, while Windows 8 is a more conservative hybrid approach.
When your history is as impressive as Microsoft's, being forced to take risks may well encourage innovation, however it would be nice if that article gave reasons why Woz thinks what he does.