After a little research, it appears that ETech4Sale is the only site on the internet claiming that the Philips VAD6037/21 is an XBox 360 DVD Drive.
A thread at xboxhacker.net discusses it, but at least one poster there stated that it was an old XBox drive. This, combined with the packaging covering up the back of the drive, as well as the old manufacturing date, leads me to believe that the information is incorrect.
Looks like someone just reported the etech4sale item to xbox-scene, and they ran with it.
Honest mistake,
Daniel Gary