It says no cash advance *fees*.
However, reading their offer more carefully:
"Cash advances: Introductory/Promotional rate N/A. Monthly rate 1.9137%. Annual rate 25.9%"
So no ATM withdrawal fee, but they charge 25.9% apr on cash advances.
NEVER use a credit card to withdraw cash from an ATM.
Nationwide Flex Account debit cards offer no currency exchange transaction fee and are therefore the best, or one of the best, ways to withdraw cash abroad.