That there can be differing viewpoints on this matter is demonstrative that sex as well as gender is a social construct: the categorization and distinguishing characteristics of sex are normative. It's deeply ironic that the people complaining about "gender ideology" are in fact its purveyors.

disorder, n. -- An illness or condition that disrupts normal physical or mental functions.

Does the condition disrupt normal physical operation of the body as it should normally operate based on the chromosomes present? Yes.