The fingerprint sensor auth will just fill in the form fields with your username and password. You can sync these over to your desktop machine and use them like you usually would there.
Also, as the post alludes, if they can figure out how to integrate the fingerprint sensor into the touch screen itself then they could, in theory, do the same with your touchpad on the Mac. So authenticating on your desktop would be the same as the phone assuming you were using a Magic Mouse or Magic Trackpad.
That would be amazing, having a password+fingerprint option built into my laptop.