Right. It is the lack of moisture which makes nitrogen good for tires.
Dry plain old air is just as good, if you can get it.
But an advantage of this dry situation is the silly pressure sensors on so many new cars. Moisture should be kept low. Who wants to replace a $200 part?
And how about the tire replacement guy who slathers on soap and water [which of course gets inside the tire in good quantities], then sells nitrogen as a benefit?