You might not, but I just have a feeling you do, but it's beside the point. I think their arguments are stupid, because from what I can tell from the article their LGBT rights education simply goes to the extent of making them aware of homosexual relationships, just like they're made aware naturally of the heterosexual relationships of their parents from a vastly earlier age than at the age they're being taught here. I think that the whole 'they're too young' argument is just a veil for their Muslim anti-LGBT beliefs.
Theoretically, if you were raised by a gay couple, would you also be too young to learn about their relationship, despite the fact there'd be literally nothing anyone could do to stop you from learning about it? It's the same concept as a child learning about heterosexual relationships from their parents, except in this case, children are learning about LGBT relationships when they're much older.