True, but not comprehensive.
The book is about an epic quest and medieval style warfare. Females are utterly outclassed in this type of combat.
Some argue that women of today can function effectively in combat. And they are probably perfectly capable of competing equally as pilots and in other combat roles. But few will claim that women could serve effectively in the Special Forces or paratroopers.
Muscle-powered combat, as in LOTR, puts an enormously greater empasis on physical prowess than any form of modern combat. Putting women into a pike formation or a heavy cavalry unit would be like putting them into the defensive line of an NFL team. They just could not compete, and as a result would be quickly slaughtered.
One of the most irritating aspects of much modern fantasy is its predilection to just ignore the basic facts of human biology.