That's absurd. If they need an Urdu speaker he can head to the Defense Language Institute.
The real reason for this is to dilute Special Forces with unqualified plants who will encourage division and undermine force loyalty.
They obviously want a sleeper enemy agent on each mission.
A lifetime ago I was assigned in an MI detachment on Taiwan. Makeup included 2 mainland born Chinese Americans, 1 each 2d generation Chinese and Japanese, and the balance white Americans (sorry, if you're a numbers guy - no Hispanic or Black Americans). Only 2 of us (both white) had not gone through Monterey language institute. Most of us had some issues with local culture but liked the people and their society/history etc., the differences we could laugh off, as did our counterparts & the 2 native born guys.
The ONE member of the det. who had constant problems with the locals was the American born Chinese translator...once busted for beating a Taipei bus with his umbrella while shouting "animals!". So much for racial advantages in dealing with the reality of "the old country".
And...
The Chinese considered us all to be European anyway.