im not an expert or anything but i think the key point in the article would be not if they throw the breaking ball, but if they are taught to throw it properly. I think if the mechanics are taught then a kid will be less likely to have an injury. I also believe if I had a little league kid i would teach him a 2 seamer , 4 seamer and a good straight change.
In our program that is the 1st thing we do with our freshman. We teach them a change -up and tell them if they want to throw for us they will need to throw this pitch for strikes before thwey can throw one pitch on the varsity.