Hmm... the article is wrong about a something.
If you actually read the DCL and the policy suggestions (links provided below) the parents do not necessarily have to be involved. In fact, in the policy suggestions section 3, it states, "Some school policies recommend, with regard to an older student, that school staff consult with the student before reaching out to the student's parents." Also, "The Massachusetts Department of Elementary and Secondary Education issued guidance... that notes: "Some transgender and gender nonconforming students are not openly so at home for reasons such as safety concerns or lack of acceptance. School personnel should speak with the student first before discussing a student's gender nonconformity or transgender status with the student's parent or guardian. For the same reasons, school personnel should discuss with the student how the school should refer to the student, e.g., appropriate pronoun use, in written communication to the student's parent or guardian."
I definitely agree with these policy suggestions. To require parental confirmation would act simply to keep transgender students from coming forward to exercise their Title IX rights.
Edit: forgot to provide the links!
http://www2.ed.gov/about/offices/list/oese/oshs/emergingpractices.pdfhttps://www.justice.gov/opa/file/850996/download