Oh bullshit. We were doing finger operated gesture user interface on the Palm in 2000 (pie menus on virtual buttons for consumer electronic IR remote control interfaces). Lots of people were using touch screens with finger gestures. The Palm included a stylus, but if the interface was designed correctly you could certainly use it with your fingers, and pie menus (self revealing gestures) worked just fine, and there is lots of older prior art and research about touch screen pie menus and gestures.