I'm not quite certain where you get that. After BSA v. Dale, the BSA legal department published three sets of standards: one each for volunteer adult leaders, employees, and youth. Those standards are no longer available online, but I still have my copy and my archived link.
With respect to youth, the BSA says that youth "membership in Boy Scouts of America is contingent upon the willingness to accept Scouting’s values and beliefs." More particularly, the BSA specifically states that homosexual youth cannot hold leadership positions. Even if you discount the fact that a youth's membership is contingent upon accepting values and beliefs that preclude being homosexual (read the full statement at the link), a youth member could never hold a leadership position in his patrol, which would preclude a Boy Scout from ever advancing past the rank of First Class.
Here's the BSA policy on youth:
Youth Leadership. Boy Scouts of America believes that homosexual conduct is inconsistent with the obligations in the Scout Oath and Scout Law to be morally straight and clean in thought, word, and deed. The conduct of youth members must be in compliance with the Scout Oath and Law, and membership in Boy Scouts of America is contingent upon the willingness to accept Scouting’s values and beliefs. Most boys join Scouting when they are 10 or 11 years old. As they continue in the program, all Scouts are expected to take leadership positions. In the unlikely event that an older boy were to hold himself out as homosexual, he would not be able to continue in a youth leadership position.