Okay...
A digital joypad has X number of positions.
You push the joystick in the direction you want and that position is ON, let go and its OFF. (the D-pad on the xbox)
It does not pick up subtle movement, its either on or off, hence why its called digital.
An analog joypad will have potentiometer motion sensors to monitor the sticks position on the X-axis and the Y-axis, this gets you the sticks exact position at any given moment in time.
Trust me, those two thumbsticks are considered analog, there is no room for debate.
The siganls of course get converted to digital to be sent to the xbox, but those sticks are of an analog design, to say otherwise is insane.
I don't know if the website is wrong, or if marketing got the wrong information or what.