If an area is restricted solely to a group that only caters for children then it should probably be treated similar to a school. If there are areas that are public or shared with other groups that include adults then it’s probably fine.
Private Residences, Farmland & K-12 says “K-12 (schools or facilities primarily focused for persons under 18 years of age) are ineligible.”
I think that was the previous assumption on the old forums. This is another situation that comes up regularly where we really need proper official clarification from the team to avoid further confusion.