WEATHER-resistant GFCI's required in bathrooms?
Device instructions do not have any standing to decide what NEC does or does not say.  

However, device instructions can, and do, make declarations about how the device itself may be used.  And these have the force of law. 


  NEC 110.3(B)  Installation and Use. Listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling.


The instructions you quote, clearly defer to NEC as to the definition of "wet locations".


  100.1
  
  Location, Damp. Locations protected from weather and not subject to saturation with water or other liquids but subject to moderate degrees of moisture. Examples of such locations include partially protected locations under canopies, marquees, roofed open porches, and like locations, and interior locations subject to moderate degrees of moisture, such as some basements, some barns, and some cold-storage warehouses.
  
  Location, Wet. Installations underground or in concrete slabs or masonry in direct contact with the earth; in locations subject to saturation with water or other liquids, such as vehicle washing areas; and in unprotected locations exposed to weather.