I write in support of Model Policies for the Treatment of Transgender Students in Virginia’s Public Schools, based on Equality Virginia's support of the Model Policies and my own review of the document.
I'd note that in addition to the Title VII citation in "Related Laws," the President's recent Executive Order on Preventing and Combating Discrimination on the Basis of Gender Identity or Sexual Orientation (January 20, 2021), might add more legal context or support for that citation, at least for public schools receiving federal funds. https://www.whitehouse.gov/briefing-room/presidential-actions/2021/01/20/executive-order-preventing-and-combating-discrimination-on-basis-of-gender-identity-or-sexual-orientation/