I've seen the same thing be used in chinese protocols of clearing / greatly helping people with stutters. They use DAF tools initially and get people to read word by word, taking sips after listening to the feedback of each word since stutterers tend to elongate or mumble words when we stutter. I've found following that same protocol along with the other therapy (you can check my profile lol) has helped drastically for me. i can send a youtube link for the playlist of vids of the chinese case studies where they use the method if you'd like