I'm not sure why the standard says they're so small... I've often wondered about that as well haha. No CsV that I've met is so small...
My 5 year old male is 100lb (45 kilogram) and 27inches (68 centimeter) at the shoulder and is in perfect shape (not an ounce of fat on him!)
I know females are quite a bit smaller than the males but still a large breed of dog!!
I know it's just the minimum requirements, but I don't know how you COULD breed a GSD and a wolf together and get that small of a dog..