I've had some jaw / speech Issues in the past myself. I think he just needs to get with a legit speech pathologist and work on his issues. Spam some tongue twisters, exercises, etc. He is not punch drunk, he legitimately has a speech disorder or something. I had one as well and I overcame It and now I'm an excellent speaker myself over time. He could be as well but I think he definitely needs to get with someone who can help him with It.