Despite the Cornell name, the med school in Qatar is considered a foreign med school, so anybody who goes there and wants to practice medicine in the states must complete the ECFMG process just like a regular FMG would.
Dont believe me?
Look at their FAQ and see for yourself.
Cornell-Qatar is a school for Qatari citizens, middle easterners, and others who want to practice medicine in the region. If Americans go there thinking they have a shortcut to practicing in the US, they are sorely mistaken.