does this technique work??

does this technique work?? Hey, My grandma was watching this Windsor/ royal family documentary about Queen Elizabeth and her family. She told me that Queen Elizabeth's father had a stutter, and he didn't want to be king because of that reason. He took speech therapy and eventually the stutter had gone away because his technique was to replace the words he had trouble with. Does anybody use that technique ? If so, what words do you replace with the words you have trouble with.