I don’t know man. This is just my experience - a lot of people have seen great results with speech therapy, so it might just work for you. It just made my stutter worse. But this thumb/index thing and strategy of letting go fixed my stutter immediately - I went from having a major stutter to almost not stuttering at all. My stutter would become worse while explaining complex information - but the thumb thing has made that easier as well as you are forced to go word to word (my mind has a tendency to be very snappy and go from A to E instead of A to B to C to D to E). I think each persons experience with a stutter is different it is a psychosomatic disorder after all.