Okay, not easy for me, English isn't my native language so I might be mistaken, but I read this article, and I don't get the feeling that I'm reading advice for stutterers in general, but rather for those who were already aware (not my case) that certain hypotheses explaining stuttering referred to these theories of left and right hemispheres (proved false here) and applied them. In fact, it seems more like an article telling speech therapy professionals to stop exploring this avenue, or even telling stutterers who train with these left-right examples. But maybe my case of not knowing about these left and right hemisphere theories is isolated.